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5 great lakes from around the world
The Caspian Sea is often classed as the world’s largest lake, even though it’s called a sea and is technically a small ocean. There’s no exact definition of where the lines between sea, lake and pond may be, but people generally have an intuitive idea of which is which – for example, lots of people have a pond in their back garden, but far fewer have a lake (and nobody has a small ocean).