Tomales Bay is a long narrow inlet of the Pacific Ocean in Marin County in northern California in the United States. It is approximately 15 miles (25 km) long and averages nearly 1.0 miles (1.6 km) wide, effectively separating the Point Reyes Peninsula from the mainland of Marin County. It is located approximately 30 miles (48 km) 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.
Of special interest is the bioluminescence that can be seen from June to November.
The Tomales Bay 10K & 20K Swim is a 10 km (6.2 mile) and 20 km (12.4 mile) ocean swim in Tomales Bay in Marin County in northern California, United States of America organized by El Sharko (aka Christopher Blakeslee).
Night Train Swimmers Training in Farallones and Tomales Bay