To the east of this divide, the elevation of the hilltops gradually decreases, and the landscape is more gently rolling. Within 30 miles (50 kilometers) of the coast, few hills exceed 300 feet (100 meters) in elevation. Near the coast, swamps, marshes, and ponds alternate with low hills. However, the Blue Hills, just south of Boston, rise above the surrounding landscape. The state probably takes its name from the Massachusett name for their highest point, Great Blue Hill, with an elevation of 635 feet (194 meters).