Introduction
Salt lakes form where water has no outlet to the ocean. As water evaporates, dissolved minerals concentrate, creating increasingly saline conditions.
The saltiest bodies of water are hostile to most life, but some harbor specialized organisms called halophiles that thrive in extreme salinity.
1. Don Juan Pond
- Salinity: 44% (12x ocean)
- Location: Antarctica
- Area: Very small (~100m x 300m)
- Temperature: Never freezes
Don Juan Pond is the saltiest body of water on Earth. It is so salty it remains liquid even at -50°C. The calcium chloride brine is fed by groundwater seeping through nearby rocks.
The pond is studied by NASA as an analog for potential liquid water on Mars.
2. Lake Retba (Lac Rose)
- Salinity: 40%
- Location: Senegal
- Color: Pink/rose
- Area: 3 km²
Lake Retba is famous for its striking pink color, caused by Dunaliella salga algae. Local salt harvesters collect up to 24,000 tonnes per year.
Harvesters coat their skin in shea butter to protect against the caustic salt water.
3. Lake Vanda
- Salinity: 35%+
- Location: Antarctica
- Depth: 75 m
- Bottom Temperature: 25°C
Lake Vanda is a permanently ice-covered lake in Antarctica with stratified layers. The bottom water reaches a warm 25°C due to solar heating through the clear ice.
It is one of the most studied lakes in Antarctica due to its unique thermal stratification.
4. Gaet'ale Pond
- Salinity: 43%
- Location: Ethiopia (Danakil Depression)
- Temperature: ~50°C
- pH: Acidic
Gaet'ale sits in one of the hottest, lowest, and most hostile environments on Earth. The Danakil Depression reaches temperatures above 50°C regularly.
The pond's extreme heat and acidity make it one of the most extreme aquatic environments known.
5. Dead Sea
- Salinity: 34.2%
- Location: Israel/Jordan/Palestine
- Surface Elevation: -430.5 m (lowest point on land)
The Dead Sea is the most famous salt lake and sits at the lowest elevation of any body of water on land. You can effortlessly float on its surface due to extreme buoyancy.
The sea is shrinking rapidly, dropping about 1 meter per year due to water diversion from the Jordan River.
6. Lake Assal
- Salinity: 34.8%
- Location: Djibouti
- Elevation: -155 m
- Notable: Lowest point in Africa
Lake Assal is the saltiest lake in Africa and sits at the lowest point on the continent. The surrounding salt flats are harvested commercially.
Temperatures around the lake regularly exceed 50°C, making it one of the hottest places on Earth.
7. Great Salt Lake
- Salinity: 5-27% (varies)
- Location: Utah, USA
- Area: ~4,400 km² (shrinking)
The Great Salt Lake's salinity varies from 5% to 27% depending on water levels. It is the largest salt lake in the Western Hemisphere.
The lake has been shrinking dramatically due to water diversion, raising concerns about toxic dust from the exposed lakebed.
8. Lake Urmia
- Salinity: ~30%
- Location: Iran
- Status: Critically endangered
Lake Urmia was once one of the largest salt lakes in the world. It has lost 80% of its water since the 1990s due to dam construction and irrigation.
Restoration efforts are underway, but the lake remains in critical condition.
9. Mono Lake
- Salinity: ~8%
- Location: California, USA
- Age: 760,000 years
Mono Lake is famous for its tufa towers, calcium-carbonate formations that rise from the water. It is one of the oldest lakes in North America.
The lake supports trillions of brine shrimp and millions of migratory birds.
10. Laguna Colorada
- Salinity: High (varies)
- Location: Bolivia
- Color: Blood red from algae
Laguna Colorada is a vivid red salt lake in the Bolivian altiplano at 4,278 meters. Its striking color comes from red algae and mineral sediments.
The lake is home to thousands of James's flamingos, one of the rarest flamingo species.
Key Facts
- Ocean water is about 3.5% salt. The saltiest lakes are 10-12 times saltier than the ocean.
- Don Juan Pond is so salty it never freezes, even at -50°C.
- The Dead Sea is dropping about 1 meter per year and may disappear within decades.
- Salt lakes often have unique pink or red colors caused by halophilic (salt-loving) organisms.
- Several of the world's saltiest lakes are in active tectonic rift zones.
Fun Facts
- You cannot sink in the Dead Sea. The extreme buoyancy forces you to float no matter what.
- NASA studies Don Juan Pond as a possible analog for liquid water that may exist on Mars.
- Great Salt Lake produces tiny brine shrimp eggs that are harvested and sold as fish food worth $60 million annually.
- Flamingos thrive at salt lakes because their beaks are specially adapted to filter brine shrimp from saline water.
Final Thoughts
The world's saltiest lakes exist at the extremes of what we consider habitable. From Antarctic ponds that never freeze to Ethiopian pools that simmer in the heat, these bodies of water push the limits of chemistry and biology.