 Otsego County has more than 370 lakes, mostly in the southern part of the county.Otsego Lake, is the county's largest, and has a surface area of .Other large lakes in the southern part of the county include Big Lake, Big Bear Lake, Buhl Lake, Crapo Lake, Dixon Lake, Douglas Lake, Guthrie Lake, Heart Lake, Lake Tecon, Manuka Lake, Opal Lake, Pencil Lake, and Turtle Lake.