Twenty kilometres from the gardens and poets' tombs of Shiraz lies a lake the colour of watermelon flesh. In the heat of summer Maharlu turns rose-pink, then deep red, a pigment so intense that airline passengers mistake it for a trick of the eye. It is not pollution and not a warning — the colour is a microscopic alga defending itself against the sun, painting an entire lakebed as it does. But the same heat that reddens Maharlu is also killing it: dammed, evaporating and twice gone completely dry, the pink lake is one of Iran's most beautiful sights and one of its most fragile.
Maharlu (دریاچه مهارلو) lies about 20 km south-east of Shiraz, a shallow seasonal salt lake cradled in the hills of Fars between the city and Sarvestan, named for the village on its shore. It is big and thin: some 28 kilometres long and up to 15 wide, but nowhere more than about three metres deep, and for much of the year far less — a broad mirror of brine laid across the valley floor at around 1,460 m above the sea. Old geographies called it Mahlu or Jenkan; today Iran calls it, simply, the Pink Lake.
That pink is the whole event. In the cool, wet months the lake fills from three seasonal rivers — the Khoshk that drains Shiraz itself, the Soltanabad and the Sarvestan — and can lie flat and blue under the sky. Then summer comes, the shallow water evaporates fast, the salt concentrates, and the lake flushes rose, then coral, then in the hottest, saltiest weeks a startling blood-red. From the air it looks like a wound in the brown land; from the shore it looks like nothing water is supposed to do. It is one of a handful of true pink lakes on earth, and by far Iran's most famous.
The lake has always been a salt mine as much as a wetland. Its water is a dense brine of sodium chloride, magnesium and sodium sulphate — far too salty for any fish, dense enough that in the dry season Maharlu becomes one of Iran's great salt deposits, harvested for the table and for industry — though in 2024, with the lake under such strain, the authorities banned salt extraction from its bed. What lives in it instead lives because of the salt: a microscopic alga that colours the water, brine shrimp that graze the alga, and the flamingos that come by the tens of thousands to graze the shrimp. It is a food chain built entirely on brine — and, in recent years, a fragile one.
Coordinates are approximate and the shoreline shifts dramatically with the season — the lake is largest in late winter and can retreat to salt flats in summer. The western shore, nearest Shiraz, is the usual approach; the reported surface area varies widely (roughly 240–600 km² across sources) because the water level does.
The pink is not a mineral, not a dye, and — despite a stubborn myth — not a toxic red tide. It is a living defence mechanism, and it works in four steps:
As summer heat bakes the shallow lake, water evaporates far faster than the seasonal rivers can replace it. The lake retreats, and the salt left behind makes the remaining water extremely briny.
Almost nothing survives that salinity — but one microscopic green alga, Dunaliella salina, flourishes in it, multiplying through the hot months into vast populations across the lake.
To protect itself from the fierce light and salt, the alga produces red carotenoid pigment — beta-carotene, the same class of compound that reddens carrots and flamingos. Each cell fills with it.
Multiply that pigment across trillions of cells and the whole lake turns colour — rose in early summer, red at the peak. When winter rain freshens the water, the alga fades and Maharlu can look blue again.
The single most repeated error about Maharlu is that its colour is a red tide — the toxic algal bloom that turns coastal seas red and kills fish. It is not. As environmental officials in Fars have stated plainly, red tide is a marine phenomenon that cannot occur in a hypersaline inland lake like this one, and the alga responsible for Maharlu's colour, Dunaliella salina, is harmless. Far from being a poison, it is farmed commercially elsewhere in the world as a source of beta-carotene for food, supplements and cosmetics. The water is undrinkable — but only because it is salt, not because it is sick. The colour is not the lake dying. The colour is the lake at its most alive.
Maharlu's beauty and Maharlu's tragedy share a cause: it is shallow, endorheic, and utterly dependent on rivers that people upstream have learned to take. Two dams above the basin — Doroudzan and Sivand — hold back water that once reached the lake, and in drought years the shortfall is catastrophic. In 2008, roughly 90% of the lake dried, collapsing it to a marsh; the flamingo population, once 100,000 to 150,000 birds, crashed to about 5,000. In 2016 Maharlu dried completely — a bare salt pan where a lake had been.
A dry salt lake is not just an absence; it is a threat. The exposed bed becomes a source of salt-dust storms — fine, saline grit lifted by the wind over the two-million-strong city of Shiraz next door, damaging lungs, farmland and soil alike, exactly as the death of Lake Urmia has done in the north-west. Maharlu is small enough, and close enough to a major city, that its drying is measured in public-health terms, not just ecological ones.
And yet it is not a lost cause. Maharlu is seasonal by nature, and a wet winter can bring it back — the water returns, the alga blooms, and the flamingos, astonishingly, find it again. The lake you see depends entirely on the year's rain: a brimming rose mirror after a good winter, a cracked white flat after a bad one. It is beautiful and it is provisional, and both facts are true at once. Come while it is still choosing to appear.
Nothing about Maharlu's ecosystem should work, and all of it hangs from a single thread of salt. No fish can survive the brine; instead the lake runs on invertebrates and the birds that eat them — a stripped-down, spectacular chain of life adapted to water that would kill almost anything else.
The pigment-making alga feeds the brine shrimp Artemia — the tiny salt-water crustacean that thrives where fish cannot. Artemia is the keystone: the whole vertebrate food chain of the lake stands on it.
Maharlu's icon. Flamingos gather to sieve Artemia from the shallows by the thousand, and it is that shrimp diet — rich in the same carotenoids that redden the lake — that turns their own feathers pink. In good years they come in enormous flocks.
When the lake holds water it draws gulls, shelducks, avocets, godwits, herons and ducks on migration between the northern hemisphere and the south — a vital stepping-stone wetland in the Fars lake system, alongside neighbouring Bakhtegan.
Around the shore, where fresh and salt meet, live the tougher land animals of the basin — foxes, jackals, wild cats, hares and reptiles — hunting the fringe of a lake whose centre belongs to salt alone.
It is a fragile marvel: cut the water and the whole tower falls, alga to shrimp to flamingo, in a single dry summer. The birds that make Maharlu famous are also its living gauge — when they return in force, the lake is healthy; when they don't, something upstream has gone wrong.
Maharlu is a low-effort, high-strangeness wonder: an easy drive from Shiraz to stand at the edge of a lake that breaks the rules of what colour water should be. Its Adventure score is modest — the challenge is exposure and unpredictability, not terrain — while its Legacy rests on a genuinely rare phenomenon, a spectacular colour, and the poignancy of a beautiful thing under threat.
You leave Shiraz after breakfast — the city of Hafez and roses and blue-tiled shade — and half an hour later the land opens out, dry and brown and ordinary, and then you crest a low rise and the valley floor below you is pink. Not a pink rock, not pink light: a pink lake, kilometres of it, lying flat and impossible under the same sun that just lit a perfectly normal city behind you. Your brain refuses it for a second. Water is not this colour. And yet there it is, to the horizon.
You walk down to the edge, over a crust of salt that crunches and then, closer in, goes soft and sticky underfoot. Up close the colour resolves into something stranger still — the water is not painted, it is full, a rose broth thick with the life that dyes it, and where the shallows meet the sky the pink and the blue trade places along a line that shivers in the heat. If it is a good year, there are flamingos: distant, absurd, standing in the red water on legs like reeds, their own pink an echo of the lake's, both of them coloured by the same invisible shrimp.
And then the thought that turns the beauty bittersweet. This colour is the lake working hardest — evaporating, concentrating, blazing with life at the exact edge of too much salt to live. The redder it burns, the closer it is to the summer that finishes it; twice in living memory it has crossed that line and vanished to bare white flat. You are looking at one of the loveliest things in Iran and one of the most precarious, in the same glance. The lake is most beautiful in the season it can least afford — and it may not always choose to appear.
A blood-red lake beside the city of poets, coloured by an alga and grazed by flamingos — a wonder so improbable it looks like a trick of the light, and so fragile it has twice simply vanished.
June to September is when heat and evaporation push the salinity high enough for the deepest pink to red. If the colour is what you came for, come in the heat — and bring serious sun protection for the shadeless bed.
March to May brings higher, often bluer water and the best birdwatching — flamingos and migrants on fuller shallows. The colour may be muted, but the life is at its peak and the heat is bearable.
September and October can offer both — lingering colour and returning migrants — with gentler temperatures. Often the sweet spot, if the year's water has held.
December to February the rivers fill the lake to its widest and freshest — least colour, most water, and the moment its whole survival is decided. A blue Maharlu is a healthy one.
The wonder is an easy drive and an open shore — the whole challenge is heat, glare, sticky mud and the lake's own unpredictability. The details, etiquette and questions people ask are below.
Maharlu is one of the easiest wonders in the collection to reach — a short drive from a major city — which makes the planning about timing and self-sufficiency, not logistics.
Maharlu lies about 20 km south-east of Shiraz in Fars Province, between the city and Sarvestan, near the village of Maharlu that gives it its name. It is an easy day trip from Shiraz by car or taxi, roughly 30–45 minutes to the western shore. There is no ticket or formal entrance; the lakebed is open, exposed and largely without facilities, so bring everything you need and go with a full tank.
From a microscopic alga, not pollution. As summer heat evaporates the shallow water, the lake grows extremely salty, and Dunaliella salina — a salt-loving alga — produces red carotenoid pigment (beta-carotene) to protect itself from the intense light. Masses of it turn the water rose-pink to blood-red. It is often wrongly called a toxic 'red tide'; Fars environmental officials have stated the alga is harmless, and red tide does not occur here. In wet winters, when the water is fresher, the lake can look blue instead.
High summer — roughly June to September — is when heat and evaporation push salinity high enough for the deepest pink to red. Spring and autumn have higher, often bluer water and are better for flamingos and birdwatching; the colour can fade then. Winter brings the fullest water but the least colour. If the pink is your goal, come in the heat; if birds are, come in the cooler seasons.
Yes, when the lake holds water. Maharlu is a wintering and migration wetland for flamingos, which feed on the brine shrimp Artemia that thrive in its salty water, along with gulls, shelducks, avocets and other waterbirds. Numbers have crashed with the droughts — from a past 100,000–150,000 flamingos to as few as about 5,000 after the 2008 drying — but wet years bring them back. Spring and autumn are the best birdwatching seasons.
It is under serious threat. Drought and upstream dams — chiefly Doroudzan and Sivand — have starved the lake of inflow: about 90% dried in 2008 and the lake desiccated completely in 2016, raising the danger of salt-dust storms over Shiraz. Wet years bring partial recovery and the flamingos return, but the long-term trend is fragile. What you see depends heavily on the recent rainfall — check conditions before you go.
You can walk the salt flats and shallow margins, but take care: the crust can hide soft, sticky mud beneath, and the shore is featureless and exposed with no shade. The water is far too salty to drink but not dangerous to touch; the alga is harmless. Wear closed shoes you don't mind getting salty, carry plenty of drinking water and sun protection, and don't drive onto the bed — vehicles get stuck in the mud.
Shiraz itself — the city of poets, with the tombs of Hafez and Saadi, the Pink Mosque and the Karim Khan citadel — is the base, 20 km away. The Achaemenid capital of Persepolis, the tomb of Cyrus at Pasargadae and the royal cliff of Naqsh-e Rostam lie to the north, and the larger salt lake of Bakhtegan is beyond Maharlu to the east. It pairs naturally as the wild, strange half-day within a classic Shiraz itinerary.
Maharlu is the wild, improbable counterpart to Shiraz's cultivated beauty — the red lake at the edge of the city of gardens. Base in Shiraz and both are yours: the tombs of Hafez and Saadi, the light-shot Pink Mosque and the Karim Khan citadel in town, and out on the plains the deep Achaemenid history of Persepolis, the tomb of Cyrus at Pasargadae and the royal cliff of Naqsh-e Rostam. For the wild green counterpoint to Maharlu's salt, the spring-fed falls of Margoon pour from the Zagros to the north-west — cold fresh water where Maharlu is hot brine, the two faces of the same province's water.
The ceremonial capital of the Achaemenid kings, an hour north of Shiraz — the stone heart of Fars to Maharlu's strange water. The classic pairing of a Shiraz-based trip. Read the article →
The royal necropolis where four Achaemenid kings lie in a cliff above Sasanian battle reliefs — deep history a short drive from the pink lake. Read the article →
The spring-fed falls of the high Zagros — cold, fresh, and pouring from a cliff with no river above. Maharlu's opposite in the same province: brine and salt against snowmelt and green. Read the article →
Maharlu's larger sister salt lake to the east — another shallow, flamingo-haunted, drought-stricken basin in the Fars lake system, sharing both the beauty and the crisis.
Give Shiraz a few days and let Maharlu be its wild morning: out to the pink lake at first light before the heat builds, then back to the gardens and the poets by afternoon. Stand at the salt edge and hold the two truths the lake insists on together — that it is one of the loveliest things in Iran, and that it is fighting, year by wet-or-dry year, simply to keep appearing. See it in colour while it still turns.
Untamed Iran prefers official and first-hand sources, and separates what is established from what varies with the water level. Maharlu's dimensions shift with the season, so figures are given with their spread declared; its ecology and crisis are well documented. The following are the sources this page draws on:
Facts last reviewed July 2026. Established: the location ~20 km south-east of Shiraz; the seasonal, hypersaline, endorheic character; the colour caused by Dunaliella salina carotenoid pigment under summer salinity, not by pollution or red tide (per Fars environmental officials); the Artemia–flamingo food chain and absence of fish; the feeder rivers; and the drying history — ~90% in 2008, total in 2016 — driven by drought and the Doroudzan and Sivand dams, with the salt-dust-storm risk to Shiraz. Varies with water level: surface area is quoted anywhere from ~240 km² (≈24,000 ha) to ~600 km², and depth and shoreline shift seasonally — this page gives the common length/width/depth figures and flags the range. Reported: historic flamingo numbers of 100,000–150,000 falling to ~5,000 after 2008 are widely cited in the Iranian press. Approximate: coordinates and the map marker, since the shoreline is not fixed.