Guam is 0.46 times as big as Okinawa (Japan)
Guam is an organized, unincorporated territory of the United States in Micronesia in the western Pacific Ocean. It is the westernmost point and territory of the United States. The territory has an area of 210 square miles (540 km2; 130,000 acres) and a population density of 775 per square mile (299/km2). In Oceania, it is the largest and southernmost of the Mariana Islands and the largest island in Micronesia.
Okinawa Island is the largest of the Okinawa Islands and the Ryukyu (Nansei) Islands of Japan in the Kyushu region. It is the smallest and least populated of the five main islands of Japan. The island is approximately 106 kilometres (66 mi) long, an average 11 kilometres (7 mi) wide, and has an area of 1,206.98 square kilometers (466.02 sq mi). It is roughly 640 kilometres (400 mi) south of the main island of Kyushu and the rest of Japan. It is 500 km (300 mi) north of Taiwan. The total population of Okinawa Island is 1.4 million.