Suffolk County topographic maps

Average elevation: 12 m

Average elevation: 6 m

The actual lake, Lake Ronkonkoma, adjacent to the CDP, is the largest lake on Long Island. The land surrounding one side of the lake is in the jurisdiction of the Town of Islip. The elevation of the lake surface is given as 55 feet (17 m) on the most recent USGS map, but as the lake is a "groundwater lake",…

Average elevation: 37 m

Average elevation: 7 m

Average elevation: 25 m

Average elevation: 31 m

Average elevation: 17 m

Average elevation: 20 m

Average elevation: 7 m

Average elevation: 3 m

Average elevation: 2 m

Average elevation: 11 m

Average elevation: 40 m

Average elevation: 3 m

Average elevation: 19 m

Average elevation: 26 m

Average elevation: 41 m

Average elevation: 4 m

Average elevation: 29 m

Average elevation: 43 m

Average elevation: 13 m

Average elevation: 13 m

Average elevation: 2 m