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The Triglav Lakes Valley is an Alpine valley situated between Bohinj and Trenta, with lakes that were formed in watertight sediment depressions at the mighty fault line of the Slatna plate. It is approximately 8 km long. The valley has strong karstic features and here we virtually meet all forms of karstic weathering in the Alps. There is also reddish Jurassic rock, in which fossils can be found.
Despite the valley sometimes being referred to as the Seven Lakes Valley, some of the lakes more resemble pools of water. There have been many discussions about the number of lakes and pools in the Triglav Lakes Valley; since some of them dry out repeatedly, we therefore do not consider them to be lakes. 'Seven' is the number referred to most often, and this is a convenient number which stems from folk tradition.
The first lake—the Lake under Vršac
or the Lake at Podstenje (1,993 m above sea level)—remains frozen during the summer. Little in the way of vegetation thrives in this environment. Lichens are found here for the most part. The Pool in Laštah at Prehodavci, which often disappears during the summer months is just south of the first lake and is located just beneath the Zasavje cottage. The Brown Lake
, which is the second Triglav lake, is just south of the Pool in Laštah at Prehodavci, and is 150 m long, 100 m wide and up to 10 m deep. The Green Lake
is found in a flat cavity nearby; its name stems from its algae content and slight greenish tint.
The fourth lake has a length of 300 m, a width of 120 m and a depth of up to 15 m and is the biggest and deepest Triglav lake. As a result, it is called the Great Lake
(1,830 m above sea level) or the Lake at Ledvica
. The vegetation is richer here due to the abundance of water.
The fifth and sixth lakes are referred to as the Double Lake
(1,685 m above sea level and aquamarine in colour). The Triglav Lakes Cottage is located here.
The seventh lake, known as the Black Lake
, got its name because of its location in a cavity in the middle of the forest. It is the warmest of the seven lakes, due to its relatively low altitude (1,319 m). It has a length of 150 m, a width of 80 m and a depth of up to 6 m.
Water is discharged into the Soča Valley and the Adriatic Sea from the highest Lake under Vršac. All the other lakes are connected to one another. Water flows into the Sava Bohinjka River and then continues on towards the Black Sea.