Satellite view of the Territory of Guam, an organized unincorporated territory of the United States. The island itself is 48 km (30 mi) long and 6 km (4 mi) to 19 km (12 mi) wide. It is the southernmost island in the Marianas island chain and is the largest island in Micronesia. Unlike many of the northern Marianas islands, Guam is not volcanically active. Image courtesy of the USGS.