Saint Clair
a borough of Pennsylvania, in Schuylkill co. It is on the Pennsylvania and the Philadelphia and Reading railroads. It is the center of an important anthracite coal region and coal mining is the leading industry. Pop. (1910) 5,640; (1920) 6,585.
ST. CLAIR, lake in North America, between Lake Huron and Lake Erie, and connected with the former by St. Clair river, with the latter by Detroit river.
It is 30 miles long, greatest breadth 24 miles, area 360 square miles. It contains several fine islands. The river St. Clair, which separates Canada and the United States, is about 40 miles long, 1 mile wide, and navigable.