Lake Van Color: Turquoise Soda-Lake Water & White Carbonate Formations

Official tourism material for Lake Van describes the lake as displaying many shades of turquoise. That description fits the lake’s familiar visual appearance, but the scientific literature on Lake Van generally measures properties such as alkalinity, suspended particles, carbonate precipitation and seasonal particle flux rather than assigning the whole lake one fixed wavelength, RGB value or laboratory color class.

This distinction matters because Lake Van does not behave like a container filled with permanently turquoise liquid. Its appearance changes across a very large surface, and suspended material can locally make the water lighter, milkier or more strongly patterned. The scientific evidence is especially strong for those pale carbonate features.

Lake Van’s giant microbialites add a second kind of white carbonate feature below the water surface. Detailed work on the northern shelf shows that their color is not uniform from the exterior to the interior. Active biological coatings, recently precipitated carbonate and older internal material can look distinctly different.

• Living outer surfaces: sampled microbialites can carry very dark green to black coatings dominated by coccoid cyanobacteria.
• Fresh mineral growth: recently formed areas can show white feather-like carbonate growths and soft white precipitates.
• Internal structure: beneath the dark surface layer, the main carbonate material can be white to beige, porous and crumbly.
• Lake-floor crusts: shallow microbialite fields may develop over pale or white carbonate substrates produced where groundwater and lake water interact.

This creates an important color contrast. A microbialite tower visible underwater may look dark or greenish because organisms cover its exterior even though carbonate precipitation is actively producing white mineral material within, beneath or at newly growing parts of the structure.

The towers form where calcium-rich groundwater is focused through the lake floor and encounters Lake Van’s alkaline water. Rapid inorganic carbonate precipitation is an important part of the process, followed by colonization by cyanobacteria and algae and additional microbially mediated mineralization. Treating the towers as either entirely biological or entirely inorganic would miss this combined formation pathway.

Lake Van’s carbonate precipitation is not limited to suspended whitings and submerged microbialites. A study published in 2025 reported the first recognized beachrock from a high-altitude soda-lake setting at Lake Van. The finding adds cemented shoreline sediment to the lake’s already diverse carbonate system.

The beachrock contains carbonate cements including aragonite, Mg-calcite and spar calcite. The researchers linked its formation to precipitation from highly saturated lake water under strong evaporation. This shoreline process is related to the same broad carbonate-rich geochemical setting that favors whitings and microbialite growth, although the physical formation pathway is different.

The beachrock finding also prevents an overly narrow interpretation of Lake Van’s pale mineral scenery. White or pale carbonate material can occur in the water column, on the lake floor, within microbialites and in cemented shoreline deposits. Each setting records a different interaction among alkaline lake water, calcium supply, evaporation, groundwater, runoff and biological activity.

Sources

• GoTürkiye — Lake Van
• Stockhecke et al. — The annual particle cycle in Lake Van (2012)
• Çağatay et al. — Microbialites on the northern shelf of Lake Van (2024)
• Ertek et al. — First Record of Beachrock in High-Altitude Soda Lakes, Lake Van (2025)
• OSM–Wikidata Match — Lake Van / Van Gölü