Isabela (province): See
1 Alicia Church (Our Lady of Atocha Parish Church), Maharlika Highway, Barangay Magsaysay, Alicia. An 18th century heritage church. (updated Jan 2026)
2 Northern Sierra Madre Natural Park (NSMNP). An extensive protected area covering a large swathe of the Sierra Madre Mountains from the boundary with Cagayan to San Mariano town. Home to the indigenous Agta/Dumagat tribes, endemic species such as the Philippine crocodile, the Philippine eagle, the Isabela oriole, pitcher plants and virgin forests, in addition to 2,000 metres (6,600 ft) peaks that have never been named or climbed by humans. (updated Jan 2026)
3 Dunoy Lake, Barangay Dibuluan, San Mariano. An isolated lake reachable only by a four-hour hike or by motorcycling on a single-lane trail, it is home to the endemic Philippine crocodile, which was rediscovered in the area in 1999. An observation tower provides sightseeing opportunities for the reptile as well as endemic birds. (updated Jan 2026)
4 Magat Dam, Burgos-General Aguinaldo Road, Barangay General Aguinaldo, Ramon. Opened in 1983, it was deemed the largest dam in Southeast Asia at the time and created a reservoir that displaced numerous communities in neighboring Ifugao. Since then it is one of the main sources of irrigation and electricity in the Cagayan Valley Region. The complex and its surroundings have become a favorite recreation spot for residents as well as day-trippers from Santiago. Fishing activities are also available at the reservoir. (updated Jan 2026)