The North West Kern RCD consists of 744, 800 acres. The Eastern area encompasses the lower reaches of Poso Creek. Starting in the general areas of Knob Hill on the South and Mt. Poso on the North, Poso Creek runs through the northern portion of the district in a Northwesterly direction and outlets into the Kern National Wildlife Refuge. The western boundary is coterminous with the San Luis Obispo County line for 12 miles and also parallels the drainage trough of the valley for approximately 45 miles south from the Kern-Kings County line. The north is bounded by Kings and Tulare Counties. The most southern part of the RCD is bounded by the City of Taft.