Isabela, the biggest province in the Cagayan Valley Region, is now one of the premier provinces of the north. It has been dubbed as the “Rice Granary of the North” having been adjudged as the Most Outstanding Province in Food Security in the Gawad Sapat Ani Awards 2000 conducted by the Department of Agriculture. It is also home to the famous Northern Sierra Madre Natural Park, a protected seascape and landscape of exceptional biodiversity.
The province is divided into three physiographic areas. The eastern area, straddled by the Sierra Madre Mountain Range, is rugged and thickly forested. A substantial portion is uncharted and the unexplored hinterlands are home to a rich variety of flora and fauna while others are government reservations. The western area is a sprawling fertile valley hemmed by the Central Cordillera and is criss-crossed by the mighty Cagayan, Siffu, and Magat Rivers. Its mountains rise to a peak of about 8,000 feet and is home to one of the world’s largest remaining low-altitude rainforests with numerous unknown endemic species of flora and fauna and exceptional biological diversity. The area is popularly known as the Northern Sierra Madre Natural Park.
Isabela comprises an aggregate land area of 10,665 square kilometers, representing almost 40 percent of the regional territory. It is the largest province in the region and the second largest province in the country in terms of land area.