A terrapin is a type of small to medium-sized turtle found primarily in brackish coastal waters. They belong to the family Emydidae and are most commonly associated with the genus Malaclemys, particularly the diamondback terrapin. These turtles are known for their distinctive patterned shells and are often found in estuarine environments along the Atlantic and Gulf coasts of the United States. Terrapins are also notable for being a popular delicacy in some regions.