From Cape Cod to Texas, along the Atlantic and Gulf coasts.
Diamondback terrapins have a light brown, gray, or black colored carapace with concentric diamond shapes. Their limbs and head are gray in color and covered in darker spots. The feet are webbed with strong claws used for climbing. Females are larger than males, but have shorter tails. Adult males can reach up to 15 centimeters in length and females can reach up to 23 centimeters in length.