I know that both Darhadin and Selenga are in Siberia and that Ozero Baykal or Baikal (I am assuming Ozero Bajkal is a alternate or more correct spelling of the same thing) is the largest (by water volume) and deepest fresh water lake in the world is in Siberia, but other than that I am so far stumped and I have never heard of Karskoje More, but if it too is a body of fresh water I am guessing it is in Russia as well

So to link them, are they all part of the same river system. i.e. The Selenga River is sourced in the Darhadin Bowl in Mongolia, flows into Ozero Baykal before emptying to the Arctic sea via Karskje More?