Lake Ontelaunee is a 1,082-acre (4.38 km2) reservoir in Berks County, Pennsylvania owned by the City of Reading. The lake was created in 1926 by the damming of Maiden Creek to extend and improve the water supply to the city. In addition, the lake provides a venue for hunters, fishermen, and hikers. The lake supports a large and varied fish population including panfish, largemouth bass, common carp, bullhead catfish, channel catfish, alewife, white perch, muskellunge, and others. No boats are allowed on this lake and there is also no swimming allowed.
Blue Marsh Lake is the largest lake in Berks County, making Lake Ontelaunee the second largest
lake.Blue Marsh is an artificial reservoir along with Lake Ontelaunee.