The Parker Valley of the Lower Colorado River is located at Parker, Arizona-Earp, California, (valley center, north). It is at the northern area of the Colorado River Indian Reservation on the Colorado River, and is also at the northern perimeter of the La Posa Plain. Poston, Arizona and Big River, California are also located in the Parker Valley.
Three major drainages into the Colorado River enter in the Parker Valley region. The Bill Williams River and its drainage watersheds, and also the Bouse Wash Drainage are in the north. The adjacent drainage from the south on the west side of the north-south La Posa Plain, is the Tyson Wash Drainage. The Tyson drainage ends prior to entering the Colorado River, just east of the river in the Colorado River Indian Reservation.
- Arizona Road & Recreation Atlas, Benchmark Maps, c 1998, pg. 38, 72.
- Arizona Road & Recreation Atlas, pg. 38, 72.
- Arizona Atlas & Gazetteer, DeLorme, c. 2002, pg. 70.
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