Vallecito, in San Diego County, California is an oasis of cienegas and salt grass along Vallecito Creek and a former settlement on the edge of the Colorado Desert in the Vallecito Valley. Its Spanish name is translated as "little valley". Vallecito was located at the apex of the gap in the Carrizo Badlands created by Carrizo Creek and its wash in its lower reach, to which Vallecito Creek is a tributary. The springs of Vallecito, like many in the vicinity, are a product of the faults that run along the base of the Peninsular Ranges to the west.