Lake Erie is one of the Great Lakes. It is located west of New York State. It is the fourth largest in surface area of the five Great Lakes, with only Lake Ontario having less surface area. It is the southernmost, shallowest, and smallest by volume of the Great Lakes. Lake Erie has an average depth of only 62 feet and a maximum depth of only 210 feet. This is why it contains less water than Lake Ontario. Compare this to Seneca Lake which, even though it has enourmously less surface area, is over 600 feet deep and has a average depth of 291 feet, which is greater than Lake Erie's maximum depth.