Tomales Bay is a long, narrow inlet of the Pacific Ocean in Marin County in northern California in the United States. Tomales Bay is approximately 15 mi long and averages nearly 1.0 mi wide, with relatively shallow depths averaging 18 ft, effectively separating the Point Reyes Peninsula from the mainland of Marin County. It is located approximately 30 mi northwes…Tomales Bay is a long, narrow inlet of the Pacific Ocean in Marin County in northern California in the United States. Tomales Bay is approximately 15 mi long and averages nearly 1.0 mi wide, with relatively shallow depths averaging 18 ft, effectively separating the Point Reyes Peninsula from the mainland of Marin County. It is located approximately 30 mi northwest of San Francisco. The bay forms the eastern boundary of Point Reyes National Seashore. Tomales Bay is recognized for protection by the California Bays and Estuaries Policy. On its northern end, it opens out onto Bodega Bay, which shelters it from the direct currents of the Pacific. The bay is formed along a submerged portion of the San Andreas Fault. The fault divides the Point Reyes Peninsula through Tomales Bay in the north, and the Bolinas Lagoon in the south. The Bear Valley Visitor Center in Point Reyes Station is home to the Earthquake Trail, where visitors can see a visible rift formed on the fault during the 1906 San Francisco earthquake.
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