The Philippine Archipelago is composed of 3 main islands Luzon, Visayas and Mindanao. This three main islands are subdivided into regions. Below is the list of regions that are geographically combined into the three island groups of Luzon, Visayas, and Mindanao.

Luzon

National Capital Region: NCR; Metro Manila
Cordillera Administrative Region: CAR
Ilocos Region: Region I
Cagayan Valley: Region II
Central Luzon: Region III
CALABARZON: Region IV-A
MIMARO: Region IV-B
Bicol Region: Region V

Visayas

Western Visayas: Region VI
Central Visayas: Region VII
Eastern Visayas: Region VIII

Mindanao

Zamboanga Peninsula: Region IX
Northern Mindanao: Region X
Davao Region: Region XI
SOCCSKSARGEN: Region XII
Caraga: Region XIII
Autonomous Region in Muslim Mindanao: ARMM