Camp Cobbossee for Boys | 235 followers on LinkedIn. Cobbossee alumni, jobs and professional profile. Maine's Premier 3 and a half week Boys Sport & Adventure camp Est. 1902 | Camp Cobbossee is an overnight summer camp for boys located on Lake Cobbosseecontee in Maine. Part sports camp, part outdoor adventure camp, part traditional sleepaway camp, Camp Cobbossee's unique program, outstanding staff, and spectacular location add up to the very best in Maine summer camps.