This small coastal lagoon is formed by a sandbar that dams Stemple Creek, which starts in the hills of Marin County and flows west near the mouth of Tomales Bay, southeast to Bodega Bay, northwest of Dillon Beach. A variety of seabirds and water species rely on its natural environment, including 923 acres of associated wetlands. The California Department of Fish and Wildlife identifies this marine protected area as one of the most significant habitat areas in the state.

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April 27, 2020

Cycling

After climbing all the way to the summits of the ridges on either side of this valley, the road drops back down all the way to sea level to cross the esteros, valleys with rivers affected by the tidal push of water upstream.

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Best routes to Estero de San Antonio

riders

1. Dillon Beach & Estero de San Antonio loop — Marin County

17.2km

01:13

330m

Moderate bike ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.

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Moderate

4.0

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2. Estero de San Antonio – Estero Americano loop from Bloomfield

25.2km

01:44

440m

Moderate bike ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.

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Moderate

4.0

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3. Estero de San Antonio – Elephant Rock loop from Bloomfield

23.0km

01:33

390m

Moderate bike ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.

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Moderate

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Elevation 0 m

Weather

Today

Thursday 5 February

21°C

7°C

0 %

Additional weather tips

Max wind speed: 18.0 km/h

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Location: Marin County, California, United States

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Estero de San Antonio

1. Dillon Beach & Estero de San Antonio loop — Marin County

2. Estero de San Antonio – Estero Americano loop from Bloomfield

3. Estero de San Antonio – Elephant Rock loop from Bloomfield

Other Popular Places to Check Out

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