Lakes
The glaciers also created large holes, known as "kettleholes,” which filled with water, forming Lake Ronkonkoma, the largest lake in Suffolk County, Artist Lake, Spring Lake (both in Middle Island), Lake Panamoka in Ridge, and others. The outwash plain that formed the South Shore of Brookhaven, resulted when the water from the melting glacier carried sand and gravel from the moraines, building up a wide sandy plain. Many streams and ponds formed in this area, including two of Suffolk's rivers, the Peconic and Connecticut (or Carmans), both of which are located within the Town.