GU — Guam

Guam is an unincorporated US territory in the western Pacific Ocean, the largest and southernmost of the Mariana Islands. Hagåtña is the capital, though most of the population lives in villages across the island. Guam is a strategic US military hub in the Pacific, with military installations covering about a quarter of the island. It uses the US Dollar. For developers, the GU country code and .gu domain identify Guam's digital presence. The +1-671 follows the North American Numbering Plan. The en-GU and ch-GU locales handle English and Chamorro respectively. Guam's strategic Pacific location and US military presence make it important in defense and logistics applications. The island is a submarine cable landing point for trans-Pacific internet infrastructure. Despite being a US territory, Guam has its own ISO 3166-1 code, appearing separately from the US in country lists — a common source of territory vs. country classification confusion in address forms and databases.