Liberty Island would resemble Hilcorp’s Northstar Island (pictured) located 31 miles to the northwest. Hilcorp has received long-awaited federal approval for its plan to build a 9-acre gravel island for drilling and production in the shallow waters of the Beaufort Sea. Liberty Island, to be located 5 miles offshore in 19 ft of water, would be the first oil and gas production facility in federal waters off Alaska. The industry has explored building a site there for more than 3 decades. It would be the fifth artificial island to operate off Alaska, with Hilcorp’s Northstar and Endicott Islands, Eni’s Spy Island, and Caelus Energy’s Oooguruk Island sitting in state waters.