Lake Baikal measures 12,239 square miles (31,700 square kilometers), making it Earth's seventh-largest lake.It is not only the world's oldest lake but also the deepest one, at about 1 mile (1.6 ...

A view of a mountain lake from a drone. People are walking along the shore ... It's a win-win, and it's why everything on iStock is only available royalty-free — including all 4K Resolution images and ...