The Alameda Mole was a facility, no longer existing, that served as a transit and transportation artery for ferries landing in the San Francisco East Bay. It was located on the West end of Alameda (the end facing San Francisco), and later became part of the Alameda Naval Air Station. It was one of three neighboring moles, the others were the Oakland Mole and the WP Mole (Western Pacific). The purpose of the mole was to extend tracks of rail-based transportation lines beyond the shallow mud flats along the shore of the East Bay, until they extended into water that was deep enough to accommodate the ferries that could transport passengers (or train cars) to San Francisco.