Silver Lake, west of Conesus Lake, would seem to qualify because it is in the Great Lakes watershed, but Waneta and Lamoka lakes are part of the Susquehanna River watershed as they drain into a tributary of the Chemung River.
Though none of the lakes' width exceeds 3.5 miles (5.6 km), Seneca Lake is 38.1 miles (61.3 km) long, and 66.9 square miles (173 km Onondaga Lake to the east, although smaller, is sometimes called "the 12th Finger Lake", because it is similar in shape.
It is in Appalachian hill terrain, with a historic village linked to other Finger Lakes by US 20.
This region straddles the northern and transitional edge, known as the Finger Lakes Uplands and Gorges ecoregion, of the Northern Allegheny Plateau and the Ontario Lowlands ecoregion of the Great Lakes Lowlands.
Cayuga and Seneca Lakes are among the deepest in the United States - 435 feet (133 m) and 618 feet (188 m) respectively - with bottoms well below sea level.
The Genesee Valley Greenway rolls through towns and countless landscapes from Rochester south to Cuba, New York.
The greenway is a work in progress, but there is a long, continuous segment (37 miles)...
The 2,000-acre (8 km) muckland of a valley in Potter, New York, which is part of Torrey Farms, was almost a 12th Finger Lake, as the waterline is just below the surface.
It lies between Lakes Canandaigua and Seneca, and was once a swamp.
It may have been formed in the same manner as the Finger Lakes, as satellite photos show three valleys similar in character and spacing to the Finger Lakes east of Otisco Lake.
The first is the Tully Valley, which includes a chain of small lakes at the south end that could be a "Finger Lake" that never formed because of a terminal moraine.
Travelers on the Lake Ontario State Parkway Trail will enjoy scenic views of wooded areas, surrounding bodies of water and wetlands.