Great Lakes form a single, naturally interconnected body of fresh water, within the Great Lakes Basin. They form a chain connecting the east-central interior of North America to the Atlantic Ocean. From the interior to the outlet at the Saint Lawrence River, water flows from Superior to Huron and Michigan, southward to Erie, and finally northward to Lake Ontario. The lakes drain a large watershed via many rivers, and are studded with approximately 35,000 islands. There are also several thousand smaller lakes, often called "inland lakes," within the basin. The surface area of the five primary lakes combined is roughly equal to
Naval Station Great Lakes opened. The policy of segregation led to small service school classes with only four or five students in a class. By 1944 Great Lakes began to integrate training and all training was integrated by mid-1945. The Golden Thirteen were commissioned in March 1944 after training at Great Lakes. Four million served on active duty in the Navy during World War II. Over one million sailors were trained at Great Lakes. In 1948, a boot camp for WAVES (female recruits) opened at Great Lakes, first graduating 5 October 1948. In 1951, female recruit training left Great Lakes for United States Naval