Lake Baikal is an ancient, vast lake in the mountainous Russian region of Siberia, north of Mongolian. It is considered the deepest lake in the world, it is 5,315 feet in depth. Not only is it the largest lake but one of the oldest lakes, it is around 25 million years old. Also,it's 20% of the world’s unfrozen freshwater reserve. A reserve is like a collection of something , or a group of something, in this case it is freshwater. Sometimes ice on the lake in can sometimes be transparent. Also, there are more than 30 rock islands in Lake Baikal. In the image below at the left you can see the ice in Lake Baikal in the winter, you can that if there were not scratches in it, it would be almost completely see though. In the one at the right its a normal lake with ice forming over it and it has a glossy coat to it making it blurry or unclear. ( yes i know one has snow another doesn't)
Some animals that live in Lake Baikal are the, seal, omul, brown bear, polecats, and tons more.