Guam is divided into 19 municipalities commonly called villages :Agana Heights,Agat, Asan‑Maina, Barrigada, Chalan‑Pago‑Ordot, Dededo, Hagåtña, Inarajan, Mangilao, Merizo, Mongmong‑Toto‑Maite, Piti, Santa Rita, Sinajana, Talofofo, Tamuning, Umatac, Yigo, Yona. The U.S. military maintains jurisdiction over its bases, which cover approximately 39,000 acres (160 km), or 29% of the island's total land area: