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Stinson Beach is off limits for the rest of the week following not just one, but two shark sightings.
Officials closed the beach Tuesday and said it will remain closed through Saturday at a minimum. They may extend the closure if more sharks are spotted.
The closure means no one can surf, boogie board or even wade into the ocean waters of the Marin County beach.
Someone spotted what is being described as a great white shark Monday. A second person reported a separate sighting Monday morning. The second sighting is what caused lifeguards to shut down the beach. It is not clear if there was more than one shark seen, but authorities aren't taking any chances.
Signs are posted along the beach to warn people.
Stinson is inside what is known as the Red Triangle, an area known for shark attacks.
Its northern end is Bodega Bay and it goes all the way south to Big Sur with the Farallon Islands making the point of the triangle.
More than a third of shark attacks in the country happen inside that region.