Malden Island is a small, uninhabited island located in the central Pacific Ocean, part of the Line Islands in the Kiribati archipelago. It covers an area of approximately 3.5 square miles and is known for its flat terrain and coral atolls. The island is primarily composed of limestone and has a tropical climate, making it a unique ecological environment. The island is significant for its historical and archaeological sites, including remnants of ancient Polynesian settlements. Malden Island was also used for nuclear testing by the United States in the mid-20th century, which has left a lasting impact on its landscape and environment.