Moosehead Lake: where more moose live than anywhere else in Maine! Where you can enjoy the largest lake in the Northeast - 40 miles long · where you can fish deep water, rivers, lakes, streams, and ponds all in one day! Where seaplanes are a way of life (every September, the largest gathering of seaplanes in the Northeast takes place in Greenville.) · where you can climb our challenging Mt. Katahdin or another of our many mountains or run some of the wildest white water in the East Where the winter landscape presents as many opportunities for wild adventure and fun as the summer · where forestry and recreation enjoy a coexistence permitting the public use of private land.