Karakul lake spread its waters in Markansu valley - one of the most driest place in Central Asia. Surrounded by high mountains which block humid air masses the valley has less than 30 mm of precipitation a year which is 3 times less than in Karakoram desert. Fluctuation of temperatures is a usual thing for desserts and in Karakul lake they are just incredible.
The great Russian Explorer of Pamirs N. Korjenevskiy, describing lake Karakul wrote: "In Febrary, at 9am the temperature was -35 Centigrade, while at 1 pm the temperature raised up to -6,2 Centigrade and so fluctuation of temperature for 4 hours was 28.8 Centigrade".
The temperature measurement taken between 1933 and 1934 shows there were only 15 frost-free days a year and by latest measurements taken in our days it is known that 67 of 100 years had no frost free periods at all.
Karakul has an area of 380 sq km and lies at the altitude of 3914 metres above sea level. It's the most highest lake in the world excluding those in Tibet and even Titicaca lake - the biggest alpine lake in the world is located on lower altitudes.