Located in the city of San Diego, Sweetwater Marsh is a small and narrow beach that is a part of the San Diego Bay National Wildlife Refuge. Sweetwater Marsh is a great birdwatching spot especially during fall and winter months, and a home to many protected and endangered birds and animals. Also known as Gunpowder Point, Sweetwater Marsh is situated on the east side of the city of Chula Vista and is densely surrounded by cities.