Oneida Lake, to the northeast of Syracuse, is sometimes included as the "thumb", although it is shallow and somewhat different in character from the rest. As with Onondaga and Cazenovia Lakes, it drains into Lake Ontario via the Oswego River and then into the St. Lawrence River ultimately draining into the Atlantic Ocean. Chautauqua Lake, Findley Lake and Kinzua Lake to the west are not considered Finger Lakes; all three drain into the Allegheny River and eventually into the Gulf of Mexico, and in the case of Kinzua and Findley, the lakes are the artificial creation of dams.