What is "round lake beach"

Population (2000): 25859
Housing Units (2000): 7608
Land area (2000): 4.995582 sq. miles (12.938497 sq. km)
Water area (2000): 0.099863 sq. miles (0.258643 sq. km)
Total area (2000): 5.095445 sq. miles (13.197140 sq. km)
FIPS code: 66040
Located within: Illinois (IL), FIPS 17
Location: 42.377155 N, 88.084105 W
ZIP Codes (1990):
Note: some ZIP codes may be omitted esp. for suburbs.
Headwords: