Do turtles live in rivers

Some do but some also live in lakes and some live in the sea. The Word turtle is widely used to describe all members of the order Testudines, it is also common to see certain members described as terrapins, tortoises or sea turtles as well. Precisely how these alternative names are used depends on the type of English being used.

British English normally uses the Word:-

turtle if they live in the sea;

terrapins if they live in fresh or brackish water;

or tortoises if they live on land.

American English tends to use the Word:-

turtle for all freshwater species and for certain land-dwelling species;

Oceanic species are usually referred to as sea turtles;

and tortoise is restricted to members of the true tortoise family the Testudinidae;

The name terrapin is typically reserved only for the brackish water

Australian English uses turtle for both the marine and freshwater species but tortoise for the terrestrial species.