What is "ash flat"

Population (2000): 977
Housing Units (2000): 485
Land area (2000): 5.560432 sq. miles (14.401453 sq. km)
Water area (2000): 0.000000 sq. miles (0.000000 sq. km)
Total area (2000): 5.560432 sq. miles (14.401453 sq. km)
FIPS code: 02470
Located within: Arkansas (AR), FIPS 05
Location: 36.231107 N, 91.609163 W
ZIP Codes (1990):
Note: some ZIP codes may be omitted esp. for suburbs.
Headwords: