Cagayan Province, including the Babuyan Island Group, is approximately 900,270 hectares, the second largest in terms of land area in Region II, and constitutes about 3% of the total land area of the Philippines.
The Balintang Channel, North of the Babuyan Islands, forms the boundary between the provinces of Cagayan and Batanes. The northern portion of Cagayan mainland opens to the China Sea, and on the east it faces the Philippine Sea. The Sierra Madre Mountains froms its rugged and mountanous eastern coast. Cagayan is bounded on the south by the Province of Isabela. The Cordilleras enclose its southwestern part, bordering on the Province of Kalinga, and its northeastern part bordering on the Province of Apayao.Political Districts/Barangays: 1 city, 28 municipalities with Tuguegarao City serving as the provincial city capital.