It actually depends! For example, most are. Like Lake Ontario and Lake Michigan.
There are many non-fresh water lakes, for example just in California there are alkaline lakes, like Honey Lake, Goose Lake, and the Salton Sea is technically a lake.
Alkaline lakes contain a high concentration of dissolved salts. These lakes are found in arid or semiarid regions and have no outlet to the sea. Alkaline lakes may also be known as saline lakes. Alkaline lakes are found on six continents and include the world's largest lake, the Caspian Sea.
Lake Superior is one of the Great Lakes, all of which are fresh water, not salty. With rare exceptions like the Great Salt Lake, a lake is always a body of fresh water while a body of salt water is called a Sea or Ocean.
a large inland body of fresh water or salt water.
Yes, Toronto is situated on the shores of Lake Ontario which is a fresh water body.
Lake
Lake Victoria
Lake or pond
A lake.
Fresh water
Lake Superior is one of the Great Lakes, all of which are fresh water, not salty. With rare exceptions like the Great Salt Lake, a lake is always a body of fresh water while a body of salt water is called a Sea or Ocean.
a lake of fresh water.
A freshwater lake.
lake