[1] The Plains of Leon are bounded on the west by the Paloma Valley, the southeastern Temescal Mountains and the valley of Warm Springs Creek after it drops below the level of the tablelands of the plains.
It is bounded on the south by Tucalota Creek (originally Alamos Creek), and the level land west of it to Warm Springs Creek and northeast of Murrieta Hot Springs.
Auld Valley is now bounded to the east by Skinner Reservoir south of Bachelor Mountain on Tucalota Creek.
Unlike the Perris Plain, which lies within the watershed of the San Jacinto River, the Plains of Leon are drained by Warm Springs Creek, French Valley Creek and Tucalota Creek, tributaries of Murrieta Creek and its parent the Santa Margarita River.
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