According to the 2000 census , the county has a total area of 561.02 square miles ( 1,453.0 km2 ) , of which 560.21 square miles ( 1,450.9 km2 ) ( or 99.86 % ) is land and 0.81 square miles ( 2.1 km2 ) ( or 0.14 % ) is water .
560.21 square miles ( 1,450.9 km2 ) ( or 99.86 % ) is land and 0.81 square miles ( 2.1 km2 ) ( or 0.14 % ) is water .