Lake Suvalosk

Lake Suvalosk is one of the largest lakes in the Ranlova continent, at the center it is 500 feet deep and is extremely cold.
The lake is constantly moving which is the reason why the lake never freezes, it is one of the few lakes on Gleron which does not freeze in extreme cold temperatures, The reason it constantly moves is that there is a volcanic vent at the very bottom which releases pressurized sulfuric gas through the lake causing bubbles.
Though the volcanic bubbles are hot they are instantly cooled by the frozen enviroment.
The lake millions of years ago used to be a large volcano which collapsed on itself creating this lake and over millions of years of global development this lead to it being a frozen lake however still having a near active volcano underneath.