sentences:  The Traverse Gap therefore allows waters which would naturally flow to the Gulf of Mexico to flow to the Arctic instead, and in the past has allowed water from Lake Traverse to flow in the other direction to Big Stone Lake in the Atlantic basin.The ancient channel at Browns Valley is a mile (1.6 km) wide and some 130 feet (40 m) deeper than the surrounding terrain through which it was carved.The distance from Lake Traverse to Big Stone Lake is about five miles (8 km).