<p>THUMS Islands are a set of four artificial islands in San Pedro Bay off the coast of Long Beach, California. They were built to tap into the East Wilmington Oil Field. The landscaping and sound walls were designed to camouflage the operation and reduce noise, and they are the only decorated oil islands in the United States.
After a 1964 court case that gave the state of California mineral rights to the area, the islands were built at an estimated cost of $22 million in 1965, the islands were operated by THUMS, a consortium named after the parent companies who bid for the island contract: Texaco, Humble Oil (now Exxon), Union Oil, Mobil Oil, and Shell Oil. The rim of the islands are made of 640,000 tons of boulders from Catalina Island, and the islands were then filled with 3.2 million cubic yards of dredged material from the bay. The islands contain significant landscaping, a waterfall, and tall structures concealing the drilling rigs, including one known as The Condo and mistaken for "a ritzy hotel" by those on land. The structures are lit in colored lights at night. The aesthetic mitigation cost $10 million at time of construction, and was overseen by theme park architect Joseph</p>