<P> On August 6, 1997, Guam was the site of the Korean Air Flight 801 aircraft accident . The Boeing 747--300 jetliner was preparing to land when it crashed into a hill, killing 228 of the 254 people on board . Since 1974, about 124 historic sites in Guam have been recognized under the U.S. National Register of Historic Places . Guam temporarily hosted 100,000 Vietnamese refugees in 1975, and 6,600 Kurdish refugees in 1996 . </P> <P> In August 2017, North Korea warned that it might launch mid-range ballistic missiles into waters within 18 to 24 miles of Guam, following an exchange of threats between the governments of North Korea and the United States . </P> <P> Guam lies between 13.2 ° N and 13.7 ° N and between 144.6 ° E and 145.0 ° E, and has an area of 212 square miles (549 km), making it the 32nd largest island of the United States . It is the southernmost and largest island in the Mariana island chain and is also the largest island in Micronesia . This island chain was created by the colliding Pacific and Philippine Sea tectonic plates . Guam is the closest land mass to the Mariana Trench, a deep subduction zone, that lies beside the island chain to the east . Challenger Deep, the deepest surveyed point in the Oceans, is southwest of Guam at 35,797 feet (10,911 meters) deep . The highest point in Guam is Mount Lamlam at an elevation of 1,334 feet (407 meters). </P> <P> The island of Guam is 30 miles (50 km) long and 4 to 12 miles (6 to 19 km) wide, three - fourths the size of Singapore . The island experiences occasional earthquakes due to its location on the western edge of the Pacific Plate and near the Philippine Sea Plate . In recent years, earthquakes with epicenters near Guam have had magnitudes ranging from 5.0 to 8.7 . Unlike the Anatahan volcano in the Northern Mariana Islands, Guam is not volcanically active . However, due to its proximity to Anatahan, vog (i.e. volcanic smog) does occasionally affect Guam . </P>

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