Grand Lake St. Marys, Ohio, is a serene lakeside destination known for its natural beauty, outdoor recreation, and rich history. While not a town or city with its own population, it is a prominent feature of the surrounding communities, including Celina and St. Marys, which have a combined population of approximately 20,000 residents. Once the world’s largest man-made lake, Grand Lake St. Marys remains a popular spot for boating, fishing, kayaking, and birdwatching.

The 13,500-acre lake is surrounded by Grand Lake St. Marys State Park, where visitors can camp, hike scenic trails, and enjoy lakeside picnics. Wildlife enthusiasts will appreciate the area’s role as a vital stopover for migratory birds. With its peaceful waters, abundant recreational opportunities, and small-town charm, the Grand Lake St. Marys region is an inviting retreat for travelers exploring Ohio’s natural wonders.