Peach Lake is a hamlet located mostly in the town of Southeast in Putnam County, New York, United States; a portion of the CDP is in the town of North Salem in Westchester County. As of the 2010 census, the population was 1,629.

Southeast is a town in Putnam County, New York, United States, so named for its location in the southeastern corner of the county. The population was 18,058 at the 2020 census. The town as a whole is informally referred to as Brewster, the town's principal settlement; the latter is also an incorporated village within the town's borders. Interstate 84, Interstate 684, U.S. Route 202, US Route 6, and NY 22 are the primary routes through the town.