The Cagayan River, also known as the Río Grande de Cagayán, is the longest river and the largest river by discharge volume of water in the Philippines. It has a total length of approximately 505 kilometres (314 mi) and a drainage basin covering 27,753 square kilometres (10,715 sq mi). It is located in the Cagayan Valley region in northeastern part of Luzon Island and traverses the provinces of Nueva Vizcaya, Quirino, Isabela and Cagayan.
Cagayan Valley, designated as Region II, is an administrative region in the Philippines. Located in the northeastern section of Luzon, it is composed of five Philippine provinces: Batanes, Cagayan, Isabela, Nueva Vizcaya, and Quirino. The region hosts four chartered cities: Cauayan, Ilagan, Santiago, and Tuguegarao.
Isabela, officially the Province of Isabela, is the second largest province in the Philippines in land area located in the Cagayan Valley. Its capital and the largest local government unit is the city of Ilagan. It is bordered by the provinces of Cagayan to the north, Kalinga to the northwest, Mountain Province to the central-west, Ifugao and Nueva Vizcaya to the southwest, Quirino, Aurora and the independent city of Santiago to the south, and the Philippine Sea to the east.
Ilagan, officially the City of Ilagan, is a 1st class component city and capital of the province of Isabela, Philippines. According to the 2020 census, it has a population of 158,218 people making it the most populous city in the province. As of 2022, it holds the title as the most number of voters in the province with 101,050 electorates.
Palanan, officially the Municipality of Palanan, is a 1st class municipality in the province of Isabela, Philippines. It also served as the final capital of the First Philippine Republic from 1900 until the capture of President Emilio Aguinaldo by the Americans during the Philippine-American War in 1901. According to the 2020 census, it has a population of 17,684 people.
Cauayan, officially the City of Cauayan, is a 3rd class component city in the province of Isabela, Philippines. According to the 2020 census, it has a population of 143,403 people.
Santiago, officially the City of Santiago, is a 1st class independent component city in the Cagayan Valley region of the Philippines. According to the 2020 census, it has a population of 148,580 people.
Alicia, officially the Municipality of Alicia, is a 1st class municipality in the province of Isabela, Philippines. According to the 2020 census, it has a population of 73,874 people.
Divilacan, officially the Municipality of Divilacan, is a 2nd class municipality in the province of Isabela, Philippines. According to the 2020 census, it has a population of 5,827 people.
Echague, officially the Municipality of Echague, is a 1st class municipality in the province of Isabela, Philippines. According to the 2020 census, it has a population of 88,410 people. The town is known for the indigenous and endangered Yogad language, which is spoken and conserved by its locals.
Gamu, officially the Municipality of Gamu, is a 4th class municipality in the province of Isabela, Philippines. According to the 2020 census, it has a population of 30,655 people.
Jones, officially the Municipality of Jones, is a 1st class municipality in the province of Isabela, Philippines. According to the 2020 census, it has a population of 45,628 people.
Mallig, officially the Municipality of Mallig, is a landlocked 4th class municipality in the province of Isabela, Philippines. The municipality has a land area of 133.40 square kilometers or 51.51 square miles which constitutes 1.07% of Isabela's total area. Its population as determined by the 2020 Census was 32,208.
San Mariano, officially the Municipality of San Mariano, is a 1st class municipality in the province of Isabela, Philippines. According to the 2020 census, it has a population of 60,124 people.
Tumauini, officially the Municipality of Tumauini, is a 1st class municipality in the province of Isabela, Philippines. According to the 2020 census, it has a population of 70,743 people.
Cagayan National High School, abbreviated as CNHS and locally known as Cagayan High, is the universal high school of Region 2. It is located in Taft Street, Tuguegarao City, Cagayan, Philippines. Established in 1905, it is the oldest public secondary level school in Cagayan and the province's premier secondary school.
Isabela State University is a public university in the province of Isabela, Philippines. It is mandated to provide advanced instruction in the arts, agricultural and natural sciences as well as technological and professional fields. The main campus is located in Echague, Isabela.
The Cauayan City National High School-Main is a public educational institution established in Cauayan, Isabela, Philippines. It was established on June 3, 1997, as an extension of Cauayan Polytechnic College, now Isabela State University-Cauayan Campus.
The Isabela School of Arts and Trades or ISAT is a public secondary and vocational school established in Ilagan, Isabela, Philippines. It is an institution that provides high school education in the province with integration of Technical Education Skills Development Authority courses.
The James L. Gordon Integrated School, commonly known as "James L.", "JLGIS", and "James Gordon", is a public integrated School located at Foster St., New Kababae, Olongapo City, Zambales, Philippines.
