Join 1 upcoming events being held in Cagayan Valley. Cagayan Valley, also known as Region II, is a picturesque region in the Philippines characterized by its vast river valleys, stunning mountain ranges, and rich biodiversity, home to several national parks and protected areas, including the Callao Caves and the Palanan Wildlife Reserve, offering a range of outdoor activities such as hiking, caving, and wildlife spotting, as well as cultural experiences showcasing the region's unique blend of indigenous and Hispanic heritage.