The CDP is 13 miles (21 km) southeast of Albany, the state capital.

The outlet of Nassau Lake, the Valatie Kill, flows south to Kinderhook Creek, which continues southwest to Stockport Creek and the Hudson River.

The Nassau Lake is currently polluted with PCBs, industrial hazardous waste and carcinogens from the Dewey Loeffel Landfill.

In 2019, the Community Advisory Group was founded on the basis of communication about future plans regarding this lake and the pollution.

This article about a location in Rensselaer County, New York is a stub.