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Killeen is a city located in the state of Texas, USA. It is situated in the central part of the state and is often considered part of the Central Texas region. This area is known for its military presence, primarily due to the presence of Fort Hood, one of the largest military installations in the world. Killeen is sometimes referred to as part of the "Texas Hill Country" region, which is characterized by its hilly terrain and scenic landscapes. It's important to note that Killeen is an urban area within the broader geographical region of Central Texas.