Cottonmouths are semi-aquatic that inhabit brackish waters and can usually be found in swamps, streams, marshes and drainage ditches of the southern lowlands of the United States. They also live at the edges of lakes, ponds, marshes, low land swamps and slow-moving streams/waters. They sun themselves on the branches, logs and stones at the edge of the water. They tend to stay within distance of a visible water source and have been known to swim even in saltwater which explains why populations of Agkistrodon have been reported on costal islands of the Atlantic ocean and Gulf of Mexico. (Howark, K. Gloyd).