Grand Lake St. Marys

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Grand Lake St. Marys
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Grand Lake St. Marys

Grand Lake St. Marys is an artificial lake located just east of Celina, Ohio and just west of St. Marys, Ohio. The lake covers 13,500 acres (55 kmĀ²) in Auglaize and Mercer counties. Grand Lake St. Marys is the largest inland lake in Ohio in terms of land area, but is extremely shallow, with an average depth of only 5 to 7 feet (1.5 to 2 m). It was constructed in the early 1800s as a reservoir for the Miami and Erie Canal. In the 1890's oil was discovered in the area, and oil derricks were set up in the lake. In 1949, it was made one of Ohio's first state parks. The lake and the surrounding state park are a popular site for recreational fishing and camping, and there are four swimming beaches.

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