Baikal is impressive. It's the deepest and the cleanest lake on Earth.
Lake Baikal is about 600km in length. Ice has different patterns in different parts of the lake. It happens because water is freezing layer by layer. Especially it is very interesting to find a fish or a branch in the ice.
The ice in Baikal is the most transparent in the world! The water in the lake is so clear, that you can see various objects on the depth of 40 meters.