17.3 acres in size. Shoreline length is 0.9 mile.
Brookers Lagoon, Isthmus Bay, Kalsin Bay, Pasagshak Bay,
Capes:Cape Chiniak, Cape Greville, Chiniak Point, Isthmus Point, Midway Point, Narrow Cape, Pasagshak Point, Pasagshak Point, Pony Point, Sequel Point,
Dams:Chiniak Satellite Tracking Station Dam,
Hills:Islands:Chiniak Island, Isthmus Island, Kekur Island, Middle Island, Svitlak Island, Ugak Island, Ugak Island, Utesistoi Island,
Lakes:Barry Lagoon, Bull Lake, Chiniak Lagoon, Chiniak Lake, East Twin Lake, Hidden Lakes, Jupiter Lake, Kalsin Pond, Lupin Lake, Neptune, Lake Rose Tead, Saturn Lake, Sawmill Lake, Twin Lakes, Uranus,
Mountains:Boyer Peak, Shaft Peak, Slope Peak, Twin Peaks,
Ridges:Rivers:Chiniak River, Olds River, Sacramento River,
Streams:Black Canyon Creek, East Fork Twin Creek, Frank Creek, Kalsin Creek, Myrtle Creek, Roslyn Creek, Twin Creek, West Fork Twin Creek, Zenter Stream,
Cities: