What is "tumwater"

Population (2000): 12698
Housing Units (2000): 5953
Land area (2000): 9.950888 sq. miles (25.772680 sq. km)
Water area (2000): 0.130672 sq. miles (0.338440 sq. km)
Total area (2000): 10.081560 sq. miles (26.111120 sq. km)
FIPS code: 72905
Located within: Washington (WA), FIPS 53
Location: 47.007768 N, 122.911074 W
ZIP Codes (1990):
Note: some ZIP codes may be omitted esp. for suburbs.
Headwords: