Preserve Locator


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Open Space Lands



33 Open Space Preserves


Alto Bowl
The Alto Bowl and Camino Alto Open Space Preserves occupy the ridge of Mount Tamalpais that runs between Corte Madera and Mill Valley. The easternmost part of the ridge is Horse Hill, appropriately named for the horses that have pastured there for many years.
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Bald Hill
This small preserve sits beside the Worn Springs Fire Road at the edge of lands managed by the Marin Municipal Water District. It flanks the undeveloped, privately owned summit of Bald Hill, a much beloved, highly visible local landmark.
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Baltimore Canyon
At the headwaters of Larkspur Creek, this preserve encompasses a lovely canyon filled with history, stately trees, and a spectacular waterfall. The trail system in this preserve connects to several of the main fire roads that traverse the north slopes of Mount Tamalpais.
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Blithedale Summit
This preserve is the largest link in a chain of preserves that follow the “Northridge” of Mount Tamalpais as it sweeps down between the communities of Mill Valley and Corte Madera.
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Bolinas Lagoon
This protected estuary, just north of the town of Stinson Beach, is a haven for birds, seals and other wildlife. The trails in the Pine Gulch Delta pass through a shaded grove and lead to the water’s edge.
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Bothin Marsh
This preserve incorporates a tidal wetland that is a small reminder of the vast salt marshes that once surrounded San Francisco Bay. This quiet inlet at the north end of Richardson Bay provides a home for several endangered species, including the clapper rail and the salt-marsh harvest mouse.
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Camino Alto
The Alto Bowl and Camino Alto Open Space Preserves occupy the ridge of Mount Tamalpais that runs between Corte Madera and Mill Valley. The easternmost part of the ridge is Horse Hill, appropriately named for the horses that have pastured there for many years.
Download map


Cascade Canyon
This lush preserve, tucked into the hills above Fairfax, is one of the true gems of the Open Space System. Cascade Canyon incorporates some of the most pristine habitat in the Corte Madera Creek watershed.
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Deer Island
No longer a true island, this preserve rises above the eastern edge of Novato from an area that was once part of the extensive wetlands in the Petaluma River delta. Though just a few minutes from both highway 101 and 37, it is a peaceful and quiet place.
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French Ranch
This 370-acre preserve was added to the Open Space system in 2000. It incorporates the south-facing slope above the eastern end of the San Geronimo Valley. Together with the Gary Giacomini and Roy’s Redwoods preserves, these lands constitute a major portion of the Lagunitas Creek watershed.
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Gary Giacomini
This huge parcel is a wild and rugged place. The windswept ridge has a high-altitude feel, accentuated by the presence of a forest of dwarf Sargent Cypress trees.
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The contact for this page is:  parksandopenspace@co.marin.ca.us