What is "head of the harbor"

Population (2000): 1447
Housing Units (2000): 501
Land area (2000): 2.817367 sq. miles (7.296948 sq. km)
Water area (2000): 0.228250 sq. miles (0.591166 sq. km)
Total area (2000): 3.045617 sq. miles (7.888114 sq. km)
FIPS code: 32963
Located within: New York (NY), FIPS 36
Location: 40.898285 N, 73.162319 W
ZIP Codes (1990):
Note: some ZIP codes may be omitted esp. for suburbs.
Headwords: