Eleven lakes make up the Finger Lakes: Conesus, Hemlock, Canadice, Honeoye, Canandaigua, Keuka, Seneca, Cayuga, Owasco, Skaneateles, and Otisco.
Seneca Lake has a maximum depth of just over 618 feet. It is not only the deepest lake in the region, but also one of the deepest (wholly contained) bodies of water in the country. For this reason, the U.S. Navy tests the sonars used on America's submarines from barges located on Seneca Lake.
Cayuga Lake is the longest of all the Finger Lakes - stretching nearly 40 miles and measuring approximately three and a half miles wide at its peak.