Walden Ridge, part of the Cumberland Plateau, provides Rhea County's border with Bledsoe County to the west. The Tennessee River forms Rhea's border with Meigs County to the east. Whites Creek, a tributary of the Tennessee River, forms Rhea's border with Roane County to the north. Watts Bar Dam straddles the Tennessee River near Spring City. The section of the river upstream from the dam is part of Watts Bar Lake, and the section downstream is part of Chickamauga Lake. A nuclear power plant, Watts Bar Nuclear Generating Station, is located near Watts Bar Dam.
Walden Ridge, part of the Cumberland Plateau, provides Rhea County's border with Bledsoe County to the west. The Tennessee River forms Rhea's border with Meigs County to the east Whites Creek, a tributary of the Tennessee River, forms Rhea's border with Roane County to the north. Watts Bar Dam straddles the Tennessee River near Spring City. The section of the river upstream from the dam is part of Watts Bar Lake and the section downstream is part of Chickamauga Lake. A nuclear power plant, Watts Bar Nuclear Generating Station, is located near Watts Bar Dam.