Vad lake, Protected natural lake in Nizhny Novgorod Region, Russia.
Vad Lake is a protected natural lake in the eastern part of the Nizhny Novgorod Region, officially classified as a natural monument of Russia. It sits in a karst sinkhole fed by powerful underground springs, which gives the water column two separate layers with noticeably different temperatures.
The lake formed when an underground karst cavity collapsed, leaving behind a deep basin that underground springs began filling over a very long period. Those same springs have kept the water flowing ever since, shaping the layered structure that visitors and divers find today.
Vad Lake draws divers from across Russia who come specifically to explore its spring-fed underwater formations. The surrounding area is also known among local fishermen, who visit the shores in search of the fish that thrive in these cold, clear waters.
The lake sits in a remote area of the region and is not easy to reach without private transport. Since it is a protected site, it is worth checking access rules in advance before planning a trip.
Divers who reach the bottom of the sinkhole report seeing the spring openings clearly, with water jetting upward from the rock with enough force to feel the current against their body. This spring pressure is also visible from the surface, where the water forms a faint dome-shaped rise above the main outlet.
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