Grand Lake St. Marys Outdoor Tours feature the Miami and Erie Canal, lake and canal tour, along withthe Celina to Coldwater bike trail.   Located between Celina and St. Marys Oh. within northwest Ohio, Grand Lake St. Marys was the largest man-made lake in the world during the era it supplied water to feed the Miami and Erie Canal.  Today Grand Lake St. Marys is still Ohio's largest inland lake.  The numerous photographs, maps, research, and outside links contained within this web site provide information on canal boats, canal history and the geography of this outdoor paradise.