Kalinga (province) in the context of "Chico River (Philippines)"

Cagayan (/kɑːɡəˈjɑːn/ kah-gə-YAHN, [kagɐˈjan]), officially the Province of Cagayan (Ilocano: Probinsia ti Cagayan; Ibanag: Provinsiya na Cagayan; Itawit: Provinsiya ya Cagayan; Isnag: Provinsia nga Cagayan; Ivatan: Provinsiya nu Cagayan; Gaddang: Provinsia na Cagayan; Filipino: Lalawigan ng Cagayan), is a province in the Philippines located in the Cagayan Valley region, covering the northeastern tip of Luzon. Its capital is Tuguegarao, the largest city of that province as well as the regional center of Region 2 (Cagayan Valley). It is about 431 kilometres (268 mi) northwest of Manila, and includes the Babuyan Islands to the north. The province borders Ilocos Norte and Apayao to the west, and Kalinga and Isabela to the south.

Cagayan was one of the early provinces that existed during the Spanish colonial period. Called La Provincia de Cagayan, its borders essentially covered the entire Cagayan Valley, which included the present provinces of Isabela, Quirino, Nueva Vizcaya, Batanes and portions of Kalinga, Apayao, and Aurora. The former capital was Nueva Segovia, which also served as the seat of the Diocese of Nueva Segovia. Today, only 9,295.75 square kilometres (3,589.11 sq mi) remain of the former vastness of the province. The entire region, however, is still referred to as Cagayan Valley.

Apayao, officially the Province of Apayao (Ilocano: Probinsia ti Apayao; Itawit: Provinsiya ya Apayao; Isnag: Provinsia nga Apayao; Tagalog: Lalawigan ng Apayao), is a landlocked province in the Philippines in the Cordillera Administrative Region in Luzon. Kabugao serves as its capital. The provincial capitol and its associated offices are located at the New Government Center in Luna.

The province borders Cagayan to the north and east, Abra and Ilocos Norte to the west, and Kalinga to the south. Prior to 1995, Kalinga and Apayao comprised a single province named Kalinga-Apayao, which was partitioned to better service the needs of individual ethnic groups.

Abra, officially the Province of Abra (Ilocano: Probinsia ti Abra; Inlaod Itneg: Probinsiya ta Abra; Maeng Itneg: Probinsiya di Abra; Moyadan Itneg: Probinsiya ti Abra; Filipino: Lalawigan ng Abra), is a province in the Cordillera Administrative Region of the Philippines. Its capital is the municipality of Bangued, the most populous in the province. It is bordered by Ilocos Norte on the northwest, Apayao on the northeast, Kalinga on the mid-east, Mountain Province on the southeast, and Ilocos Sur on the southwest.