Astronaut Ivan Vagner captured from ISS Lake Khuvsgul (Khövsgöl), Mongolia. As shown in the photo, the surface of the lake freezes over completely in winter.

Credit: Ivan Vagner, Roscosmos

Lake Khövsgöl (Khuvsgul) is the largest fresh water lake in Mongolia by volume and second largest by area. It is located near the northern border of Mongolia. It is also the second-most voluminous freshwater lake in Asia, and holds almost 70% of Mongolia’s fresh water. Khuvsgul is the most significant drinking water reserve of Mongolia as its water is potable without any treatment. Hovsgol is an ultraoligotrophic lake with low levels of nutrients, primary productivity and high water clarity (Secchi depths > 18 m are common). Hovsgol’s fish community is species-poor compared to that of Lake Baikal. The ice cover in winter is strong enough to carry heavy trucks; transport routes were installed on its surface as shortcuts to the normal roads. However, this practice is now forbidden to prevent pollution of the lake from both oil leaks and trucks breaking through the ice. It is estimated that 30-40 vehicles have sunk into the lake over the years.

The local scenery on the ground is as follows.

Credit: Nomad Tours

The lake is summer is as follows.

Credit: Wikipedia

Reference: Ivan Vagner’s Tweet
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