Triangle Marsh

Triangle Marsh is a 31-acre wetland site at the base of Ring Mountain on the Tiburon Peninsula in Marin County. The area includes both marshland and upland habitats that support the broader San Francisco Bay ecosystem.

Early Miwok communities settled near the marsh over many centuries, taking advantage of the abundant food resources from the water and surrounding land. This extended occupation made the location a significant hub for local indigenous societies.

The rock carvings on Ring Mountain show that indigenous people used the area for artistic and spiritual purposes. These petroglyphs tell us about the sacred connection between the Miwok and this land.

The site is managed by the Audubon Society with ongoing habitat restoration work happening throughout the year. Visitors should wear sturdy footwear and be prepared for wet and sometimes muddy ground conditions.

The marsh shelters several endangered animal species including the California clapper rail and the salt marsh harvest mouse that few visitors know about. These rare creatures depend on this habitat's specialized saltwater and freshwater zones to survive.

Location: California

GPS coordinates: 37.92229,-122.49666

Latest update: December 14, 2025 14:42