The Grand Lake of St. Marys was originally constructed as a reservoir for the Miami and Erie Canal which connected the Ohio River with the Great Lakes. When it was completed in 1845, it was considered the largest man-made lake in the world at 13,500 acres. The attraction was also one of the first in Ohio to be named a state park. The site has been a long-time summer tourist destination for Ohioans which features boating, jet skiing, fishing, numerous public beaches, and historic surrounding communities including St. Marys, Coldwater, St. Henry, Celina, Montezuma, and Chickasaw. The Grand Lake also hosted the 2013 Governors Cup Regatta, a competition of hydroplane boats racing over 100 mph.