Blue Marsh Lake
 Blue Marsh Lake is an artificial lake located northwest of the city of Reading Pennsylvania USA and managed by the U.S. Army Corps of Engineers Philadelphia District. It is in western Berks County fed into by the Tulpehocken Creek. The main span of the lake is along the border between Bern and Lower Heidelberg Townships. However the northwesternmost portions lie in the more sparsely populated North Heidelberg and Penn Townships.