Lake Sfânta Ana

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Lacul Sfânta Ana
Szent Anna-tó-1.jpg
Lake Sfânta Ana
Location Harghita County, Romania
Coordinates 46°7′35″N 25°53′17″E / 46.12639°N 25.88806°E / 46.12639; 25.88806Coordinates: 46°7′35″N 25°53′17″E / 46.12639°N 25.88806°E / 46.12639; 25.88806
Type crater lake
Basin countries Romania
Max. length 620 m
Max. width 460 m
Surface area 19.3 ha
Average depth 6.4 m
Max. depth 7 m
Shore length1 1617 m
Surface elevation 946 m
1 Shore length is not a well-defined measure.

Lake Sfânta Ana (Romanian pronunciation: [ˈsfɨnta ˈana]; Hungarian: Szent Anna-tó, meaning "Saint Anne Lake" in both languages) is the only crater lake in Romania located in the volcanic crater of the volcano named Ciomatu Mare (Nagy Csomád in hungarian) of the Eastern Carpathians, near Tușnad in the Natural Reserve of Mohoș, Harghita County, Romania.

Palynology studies concluded that the history of Lake Saint Anne began about 9,800-8,800 years ago, at the stage of peat bog and shallow lake.

It has an oval form and an area of 220,000 m².

According to measurements made in 2005, the maximum depth of the lake is 6.4 m and the sediment thickness is about 4 m. The lake is supplied exclusively from precipitations, therefore the degree of mineralization of the water is very low. The water purity approaches of that of distilled water, with only 0.0029 ml mineral

In winter, the lake is covered with a layer of ice of up to 1 m

Near the lake there is a Roman Catholic chapel dedicated to Saint Anne.