Elkhorn Slough is a coastal estuary located in Monterey County, California. It is part of the larger Monterey Bay National Marine Sanctuary and is known for its rich biodiversity, including various species of birds, marine mammals, and plants. The slough is an important habitat for wildlife and serves as a critical stopover point for migratory birds along the Pacific Flyway. The estuary covers approximately 1,700 acres and features a mix of tidal marshes, mudflats, and open water. It is a popular destination for outdoor activities such as kayaking, birdwatching, and hiking, attracting nature enthusiasts and researchers alike.