This post is describing how the Philippines are administratively divided. This is a topic that may interest some and bore others! However, it something of interest to me when I visit a new country or at least study about it.
The Philippines are divided into three island groups: Luzon, Visayas, and Mindanao. Then the Philippines is divided into, from the highest division to the lowest: autonomous regions, regular administrative regions do not have political power, provinces and independent cities, municipalities and component cities, and barangays. As of March 2010, these islands were divided into 17 regions, 80 provinces, 138 cities, 1,496 municipalities, and 42,025 barangays. A barangay (Filipino: baranggay, [baɾaŋˈɡaj]) is the smallest administrative division in the Philippines and is the native Filipino term for a village, district or ward. Municipalities and cities are composed of barangays, and they may be further subdivided into smaller areas called purók (English: zone), and sitio, which is a territorial enclave inside a barangay, especially in rural areas. In writing, barangay is sometimes abbreviated to "Brgy." or "Bgy.". As of June 28, 2011 there are a total of 42,026 barangays throughout the Philippines.
For those of you who like diagrams here you go: