Upper Newport Bay is a coastal estuary located in Newport Beach, California. It is part of the California Coastal National Monument and serves as a vital habitat for various wildlife, including migratory birds and marine species. The bay is surrounded by parks and trails, making it a popular spot for outdoor activities like hiking, biking, and birdwatching. The area is also significant for its ecological importance, as it supports a diverse range of ecosystems, including salt marshes and mudflats. Upper Newport Bay is managed by the City of Newport Beach and the California Department of Fish and Wildlife, ensuring the preservation of its natural resources.