Triangle Marsh is a wetland of the San Francisco Bay

San Francisco Bay

San Francisco Bay is a shallow, productive estuary through which water draining from approximately forty percent of California, flowing in the Sacramento and San Joaquin rivers from the Sierra Nevada mountains, enters the Pacific Ocean...

 situated at the base of Ring Mountain

Ring Mountain (California)

Ring Mountain is an elevated landform on the Tiburon Peninsula in Marin County, California. This mountain was named for George E. Ring, who served as a Marin County Supervisor from 1895 to 1903.A number of rare and endangered flora inhabit Ring Mountain...

 at the north end of the Tiburon Peninsula

Tiburon Peninsula

The Tiburon Peninsula , or simply "the Tiburon", is a region of Haiti encompassing all of Haiti's southern coast. It starts roughly at the southernmost of the Haiti-Dominican Republic border and extends westward near Cuba, forming a large headland. Four of Haiti's ten departments are located...

 in Marin County, California

Marin County, California

Marin County is a county located in the North San Francisco Bay Area of the U.S. state of California, across the Golden Gate Bridge from San Francisco. As of 2010, the population was 252,409. The county seat is San Rafael and the largest employer is the county government. Marin County is well...

, USA.

Archaeological Pecked curvilinear nucleated

Pecked curvilinear nucleated

Pecked curvilinear nucleated, in archaeology, is a form of prehistoric rock carving. The term was originally proposed by Teresa Miller and Reed Haslam in 1976 to describe a widespread type of rock carving in western North America. The form is characterized by a circular or oval groove element,...

 petroglyph

Petroglyph

Petroglyphs are pictogram and logogram images created by removing part of a rock surface by incising, picking, carving, and abrading. Outside North America, scholars often use terms such as "carving", "engraving", or other descriptions of the technique to refer to such images...

s, and recovery on Ring Mountain, hold significant evidence of Native American

Native Americans in the United States

Native Americans in the United States are the indigenous peoples in North America within the boundaries of the present-day continental United States, parts of Alaska, and the island state of Hawaii. They are composed of numerous, distinct tribes, states, and ethnic groups, many of which survive as...

 habitation and likely proof that early Miwok

Miwok

Miwok can refer to any one of four linguistically related groups of Native Americans, native to Northern California, who spoke one of the Miwokan languages in the Utian family...

 peoples exploited marine resources from Triangle Marsh.

The 31 acres (125,452.7 m²) property is owned by the Marin branch of the National Audubon Society

National Audubon Society

The National Audubon Society is an American non-profit environmental organization dedicated to conservation. Incorporated in 1905, Audubon is one of the oldest of such organizations in the world and uses science, education and grassroots advocacy to advance its conservation mission...

who restored upland and wetland habitats there with funding from a variety of sources. Federal endangered species including the Clapper Rail and Salt Marsh Harvest Mouse live in the Marsh.