Duxbury Reef is the largest shale intertidal reef in North America, extending over a mile into the ocean at low tide. The Agate Beach County Park trail provides clifftop views of the reef and tide pools below. At extreme low tides, the exposed reef creates an otherworldly landscape of channels and pools.
Photography Guide
Best Time
morning
Crowds
Quiet
Shot Types
widelandscapedetaillong-exposure
Best Seasons
winterspring
Practical Tips
Check tide tables and visit during a minus tide for the most exposed reef. Access from the end of Elm Road in Bolinas or via the Mesa Road path from Agate Beach. The reef is a marine reserve; do not remove any organisms.
Is it a good day to go?
7-day outlook
Mild, dry days with light winds are the most comfortable for a visit.
Forecast by Open-Meteo. Verdicts weigh the forecast against the conditions that suit this spot.
Gallery
Low tide reveals a broad, rock-strewn shoreline with rounded boulders, wet seaweed, and shallow water stretching to the horizon. Warm morning light catches the stones and a few larger offshore rocks beneath a pale, cloud-streaked sky. Photo: Abrget47j / Wikimedia Commons / CC BY-SA 3.0Wide coastal view from a clifftop overlooking pale sand, a curving shoreline, and a broad rocky intertidal shelf stretching into deep blue water. Small waves break across the reef under a bright morning sky with scattered clouds, with a few tiny figures standing on the rocks. Photo: Toby Hudson / Wikimedia Commons / CC BY-SA 3.0Wide coastal view from a high overlook, with dark volcanic cliffs and jagged sea stacks dropping into clear blue water below. Soft morning light brings out rust-red and gray rock layers under a sky with scattered white clouds. Photo: Richard Bartz / Wikimedia Commons / CC BY-SA 3.0Long-exposure waves blur around a cluster of rounded reef rocks, with a large angular boulder centered against a calm, glowing sunrise sky. Soft gray water and misty spray flatten the foreground into a dreamy coastal scene. Photo: Abrget47j / Wikimedia Commons / CC BY-SA 3.0Wide morning view from a clifftop overlooking Duxbury Reef, with dark shale ledges and tide pools stretching into the surf below. The reef’s layered, rippled channels contrast with the blue water and low coastal light. Photo: Diego Delso / Wikimedia Commons / CC BY-SA 3.0A stone church sits on a cliff above a calm, steel-gray lake, with cypress trees and terraced walls leading down to the water. Snowy mountains line the far horizon beneath a cloudy sky, giving the scene a quiet, cool morning feel. Photo: Diego Delso / Wikimedia Commons / CC BY-SA 3.0A wide coastal view shows rust-red and gray volcanic cliffs dropping to a bright blue ocean, with dark rocky islets and white surf breaking around them. Puffy clouds drift over the headland, and a pale sandy cove sits tucked beneath the rugged ridge line. Photo: Simone Marinho / Wikimedia Commons / CC BY-SA 3.0Low tide exposes a dark shale reef and shallow tide pools beneath a steep, sandy cliff, with smooth water reflecting the bright overcast sky. Pebbly foreground and scattered rock outcrops lead the eye toward the distant coastline, giving the scene a stark, windswept feel. Photo: ~jar{} from Berkeley, CA / Wikimedia Commons / CC BY 2.0A large bronze bell hangs between two weathered stone pillars on a raised platform by the sea, with wet ground in the foreground and a gray, overcast sky stretching over the calm horizon. The low, dramatic composition emphasizes the rough stone texture and the lone coastal setting. Photo: Dmitry A. Mottl / Wikimedia Commons / CC BY-SA 3.0Several fishermen in shallow surf push a small, weathered blue boat toward shore, with pelicans floating in the calm water behind them. The scene is bright and busy, with wet sand, foamy waves, and tangled fishing net in the foreground. Photo: Tomascastelazo / Wikimedia Commons / CC BY-SA 3.0
