For 10 points, name this westernmost territory of the United States.
Babe Island and Cocos Island lie to the southwest of this one, which also contains the Fena Valley Reservoir. It has a natural harbor at Apra, and its mountains include Mt. Sasalaguan and its tallest, Mt. Lamlam. Andersen Air Force Base is on this island, as is the War in the Pacific National Historic Park, and villages here include Yigo, Dededo, and its capital of Hagåtña. Locals on this island speak the Chamorro language, and its motto in English is "Where America's day begins". For 10 points, name this westernmost territory of the United States.
Babe Island and Cocos Island lie to the southwest of this one, which also contains the Fena Valley Reservoir.
Guam