You searched for: Place Illinois Remove constraint Place: Illinois Place Uncharted Hill Seep. 0.55 mile southeast of Illinois Power Plant, west side of & above the west Fork of the Vermilion River. Danville NW 7.5 minute topo. Remove constraint Place: Uncharted Hill Seep. 0.55 mile southeast of Illinois Power Plant, west side of & above the west Fork of the Vermilion River. Danville NW 7.5 minute topo. Place Vermilion Remove constraint Place: Vermilion Topic Poales Remove constraint Topic: Poales