A terrapin is one of several small species of turtle living in fresh or brackish water. Terrapins do not form a taxonomic unit, and may not be very closely related, although many belong to the families Geoemydidae and Emydidae. A distinction between turtle and terrapin does not exist in other European languages. The name "terrapin" is derived from the Algonquian word torope, used for Malaclemys terrapin. In the UK, red-eared sliders are known as red-eared terrapins.