Hayward Regional Shoreline is a regional park located on the shores of the San Francisco Bay in Hayward, California. It is part of the East Bay Regional Parks system. The 1,713-acre park extends to the shores of San Lorenzo. Part of the park is former commercial salt flats purchased in 1996. A former landfill, now capped with soil and plants, is located in the park. The park includes the 250-acre tidal wetland, Cogswell Marsh, and the 364-acre Oro Loma Marsh.