Guam ( or ; Chamorro: ; formally the Territory of Guam) is an unincorporated and organized territory of the United States. Located in the northwestern Pacific Ocean, Guam is one of five American territories with an established civilian government. The capital city is Hagåtña, and the most populous city is Dededo. In 2015, 161,785 people reside on Guam. Guamanians are American citizens by birth. Guam has an area of and a density of 297/km² (770/sq mi). It is the largest and southernmost of the Mariana Islands, and the largest island in Micronesia. Among municipalities, Mongmong-Toto-Maite has the highest density at 1,425/km² (3,691/sq mi) and Inarajan has the lowest density at 46/km² (119/sq mi). The highest point is Mount Lamlam at above sea level.

The GUAM Organization for Democracy and Economic Development ( ,  ,  ,  ,  ) is a regional organization of four post-Soviet states: Georgia, Ukraine, Azerbaijan, and Moldova.