Isabela is one of five provinces that comprise the Cagayan Valley ( Region II ).

The province is subdivided into thirty-five (35) municipalities and two cities, with a total of 1,055 barangays repesented as four congressional districts. The seat of the provincial government is at the capital city of Ilagan.

Isabela, the biggest province in the Cagayan Valley, is one of the premier provinces of the north, home to the famous Northern Sierra Madre Natural Park, a protected seascape and landscape of exceptional biodiversity. The Natural Park is a haven for researchers and outdoor enthusiasts, declared number one in biodiversity in the country and also at the world’s top ten biodiversity hotspots.

Other pristine seascapes and landscapes proliferate at the eastern coast of the province. The towns of Divilacan, Maconacon, Dinapigue, and Palanan are recommended for trekking, mountaineering, camping and exploration.

One of the biggest dams in Asia, The Magat Dam Tourism Complex is comprised of the Power House and related facilities. The water from the dam generates 360 megawatts of electricity for the Luzon Grid and supplies the irrigation diversion requirement for 102,000 hectares of agricultural land in Cagayan and the Cordillera.

Located at Fuyo National Park, Sta. Victoria Caves and Environmental School is the first of its kind in the region to give environmental awareness education to its patrons. The area is a favorite destination for family bonding and educational trips.

The ancient Catholic churches of Isabela are among the more interesting representatives of Spanish colonial architecture in the Philippines. Made almost entirely of brick, because of the lack of quarry stones in the Cagayan region, the churches are intricately decorated with unusual motifs. The churches of San Pablo (old Cabagan), Tumauini and Echague (formerly Camarag) are fine examples of this unique architecture.