McDonald Island (California)

Tule Island is a small island in the Sacramento–San Joaquin River Delta, which exists as part of a complex of islands including directly-adjacent Fern Island and Headreach Island. It is a naturally-formed island, which was used in the early 20th century to farm potatoes, but now consists mostly of marsh. It is currently a habitat for waterfowl and is used as a fishing spot.

Headreach Island is a small island in the Sacramento–San Joaquin River Delta, in northern California. A naturally-formed island existing in a complex with Tule Island to the southeast and Fern Island to the northwest, it was used for farming as late as the 1920s. While several proposals for real estate development on the island were made in the late 20th century, it now consists mostly of marsh and submerged land. Black rails live on the island.

Spud Island is a small island of the San Joaquin River, located in the Sacramento–San Joaquin River Delta in northern California. It was once used to farm onions; while it is no longer used for agriculture, it remains inhabited. In the late 20th century it was the site of a county park, which offered camping, fishing and swimming amenities free of charge.

Mildred Island is a submerged island in the San Joaquin River delta, in California. It is part of San Joaquin County. It flooded in 1983, and the land was abandoned. Its coordinates are 37.9863117°N 121.5230069°W / 37.9863117; -121.5230069 (Mildred Island). It appears on 1913 and 1952 United States Geological Survey maps of the area.

Tinsley Island is a small island in the Sacramento–San Joaquin River Delta, in San Joaquin County, California, next to the Stockton Deepwater Shipping Channel. It was created in the 1930s, when dredging to improve the navigability of the San Joaquin River cut it off from Roberts Island. Since 1958, it has been owned by the St. Francis Yacht Club. In 1960, the club transported a lighthouse from San Francisco Bay to serve as its clubhouse, and in the same year began an annual "Stag Cruise"; as of 2024, the club still owns the island and maintains a clubhouse there.

Acker Island (also known as Lost Isle) is a small island in the Sacramento–San Joaquin River Delta. It is part of San Joaquin County, California. Its coordinates are 37°59′51″N 121°26′56″W, and the United States Geological Survey measured its elevation as 3 ft (0.91 m) in 1981. It appears on a 1952 USGS map of the area.

Medford Island is a small island in the San Joaquin River delta, in California. It is part of San Joaquin County, and managed by Reclamation District 2041. Its coordinates are 38.0371435°N 121.5113407°W / 38.0371435; -121.5113407 (Medford Island).

Hog Island is an island in the San Joaquin River, and is one of many islands which constitute the Sacramento–San Joaquin River Delta. It was used for agriculture in the early 20th century, but has now mostly become marsh or submerged land; it remains a spot for fishing, particularly halibut and striped bass.

Ward Island (also known as Wards Island) is a small island in the Sacramento–San Joaquin River Delta. It is part of San Joaquin County, California. Its coordinates are 38°02′30″N 121°30′09″W, and the United States Geological Survey measured its elevation as 7 ft (2.1 m) in 1981. It appears on a 1952 USGS map of the area.

Little Venice Island is a small island in the Sacramento–San Joaquin River Delta. It is part of San Joaquin County, California. Its coordinates are 38°03′02″N 121°30′05″W, and the United States Geological Survey measured its elevation as 0 ft (0 m) in 1981. It appears on a 1952 USGS map of the area.