Central Luzon in the context of "Cagayan River"

The Ilocos Region (Ilocano: Rehion/Deppaar ti Ilocos; Pangasinan: Rehiyon na Ilocos; Tagalog: Rehiyon ng Ilocos), designated as Region I, is an administrative region of the Philippines. Located in the northwestern section of Luzon, it is bordered by the Cordillera Administrative Region to the east, the Cagayan Valley to the northeast and southeast, Central Luzon to the south, and the South China Sea to the west. The region comprises four provinces: Ilocos Norte, Ilocos Sur, La Union, and Pangasinan, along with one independent-component city, Dagupan City. The regional center is the city of San Fernando in La Union, which serves as the administrative hub of the region. The largest settlement in terms of population is San Carlos City in Pangasinan.

The 2020 Philippine Statistics Authority census reported that the ethnolinguistic group composition of the region is predominantly made up of Ilocanos (58.3%), followed by Pangasinans (29.7%), Tagalogs (4.1%), and various Cordilleran (Igorot) indigenous groups.

Quezon City (UK: /ˈkeɪzɒn/, US: /ˈkeɪsɒn/; Filipino: Lungsod Quezon [luŋˈsod ˈkɛson] ), also known as the City of Quezon and Q.C. (read and pronounced in Filipino as Kyusi), is the most populous city in the Philippines. According to the 2024 census, it has a population of 3,084,270 people. It was founded on October 12, 1939, and was named after Manuel L. Quezon, the second president of the Philippines. Quezon City served as the capital of the Philippines from 1948 until 1976, when the designation was returned to Manila.

The city was intended to be the national capital of the Philippines that would replace Manila, as the latter was suffering from overcrowding, lack of housing, poor sanitation, and traffic congestion. To create Quezon City, several barrios were carved out from the towns of Caloocan, Marikina, San Juan and Pasig, in addition to the eight vast estates the Philippine government purchased for this purpose. It was officially proclaimed the national capital on October 12, 1949, and several government departments and institutions moved out of Manila and settled into the new capital city. This necessitated the expansion of the city northward, carving out Novaliches from Caloocan which divided it into two non-contiguous parts. Several barrios were also taken from San Mateo and parts of Montalban. However, on June 24, 1976, Presidential Decree No. 940 was enacted, which reverted national capital status to Manila while the whole of Metro Manila was designated as the seat of government. The city was also chosen as the regional center of Southern Tagalog, which was created in 1965, along with the provinces of Quezon and Aurora, the birthplace of Manuel L. Quezon; however, its status of regional center became ineffective when the region was divided into Calabarzon and Mimaropa, through the effect of Executive Order No. 103 in May 2002 under the presidency of Gloria Macapagal Arroyo, and Aurora was transferred to the authority of Central Luzon, with Southern Tagalog limited to being a cultural-geographic region.

Metropolitan Manila (Filipino: Kalakhang Maynila [kalakˌhaŋ maɪˈnilaʔ]), commonly shortened to Metro Manila and formally the National Capital Region (NCR; Filipino: Pambansang Punong Rehiyon), is the capital region and largest metropolitan area of the Philippines. Located on the eastern shore of Manila Bay, the region lies between the Central Luzon and Calabarzon regions. Encompassing an area of 636.00 km (245.56 sq mi) and with a population of 13,484,462 as of 2020, it consists of sixteen highly urbanized cities: Manila—the capital city—Caloocan, Las Piñas, Makati, Malabon, Mandaluyong, Marikina, Muntinlupa, Navotas, Parañaque, Pasay, Pasig, Quezon City, San Juan, Taguig, and Valenzuela, along with one independent municipality, Pateros. As the second most populous and the most densely populated region in the Philippines, it ranks as the 7th most populous metropolitan area in Asia and the 6th most populous urban area in the world.

The region is the center of culture (including arts and entertainment), economy, education, and the government. Designated as a global power city, the region exerts a significant impact on commerce, finance, media, art, fashion, research, technology, education, and entertainment both locally and internationally. It is home to all embassies in the Philippines, making it an important center for international diplomacy in the country. Its economic power establishes the region as the country's premier center for finance and commerce. The region accounts for 36% of the gross domestic product (GDP) of the Philippines. Greater Manila is the fourth largest ASEAN country subdivision by GDP, after Singapore, and the Jakarta, and Bangkok metropolitan regions.

Zambales, officially the Province of Zambales (Sambal: Probinsya nin Zambales; Ilocano: Probinsia ti Zambales; Pangasinan: Luyag na Zambales; Kapampangan: Lalawigan ning Zambales; Tagalog: Lalawigan ng Zambales), is a province in the Philippines located in the Central Luzon region. Its capital is Iba, which is located in the middle of the province. Olongapo is the largest city of the province wherein it is geographically located but politically independent.

Zambales borders Pangasinan to the north and northeast, Tarlac to the east, Pampanga to the southeast, Bataan to the south and the South China Sea to the west. With a total land area of 3,830.83 square kilometres (1,479.09 sq mi) (including the independent city of Olongapo), Zambales is the second largest among the seven provinces of Central Luzon after Nueva Ecija. The province is noted for its mangoes, which are abundant from January to April.

Tarlac, officially the Province of Tarlac (Kapampangan: Lalawigan ning Tarlac; Pangasinan: Luyag na Tarlac; Ilocano: Probinsia ti Tarlac; Tagalog: Lalawigan ng Tarlac; [tɐɾˈlak]), is a landlocked province in the Philippines located in the Central Luzon region. It had a population of 1,503,456 people according to the 2020 census. Its capital is the city of Tarlac, which is the most populous in the province. It is bounded on the north by the province of Pangasinan, Nueva Ecija on the east, Zambales on the west, and Pampanga in the south. The province comprises three congressional districts and is subdivided into 17 municipalities and one city, Tarlac City, which is the provincial capital.

The province is situated in the heartland of Luzon, in what is known as the Central Plain also spanning the neighbouring provinces of Pampanga, Pangasinan, Nueva Ecija, and Zambales. Tarlac covers a total land area of 3,053.45 km (305,345 ha).

Pampanga, officially the Province of Pampanga (Kapampangan: Lalawigan ning Pampanga; Tagalog: Lalawigan ng Pampanga), is a province in Central Luzon, Philippines. Lying on the northern shore of Manila Bay, Pampanga is bordered by Tarlac to the north, Nueva Ecija to the northeast, Bulacan to the east, Manila Bay to the south, Bataan to the southwest, and Zambales to the west. Its capital is San Fernando, the regional center of Central Luzon. Angeles City is the largest city in Pampanga but is administratively independent. It has been self-governing since receiving its charter in 1964.

The name La Pampanga was given by the Spaniards, who found natives living along the banks (pampáng) of the Pampanga River. It was created in 1571 as the first Spanish province on Luzon (the province of Cebu in the Visayas is older, founded in 1565). The town of Villa de Bacolor briefly served as the Spanish colonial capital when Great Britain occupied Manila during the Seven Years' War. On the eve of the Philippine Revolution in 1896, Pampanga was one of eight provinces placed under martial law for rebelling against the Spanish Empire. It is represented on the Flag of the Philippines by one of the eight rays of the sun.

The Tagalog people are an Austronesian ethnic group native to the Philippines, particularly the Metro Manila and Calabarzon regions and Marinduque province of southern Luzon, and comprise the majority in the provinces of Bulacan, Bataan, Nueva Ecija, Aurora, and Zambales in Central Luzon and the island of Mindoro.

Iloco (also Ilóko, Ilúko, Ilocáno or Ilokáno; /iːloʊˈkɑːnoʊ/; Iloco: Pagsasaó nga Ilóko) is an Austronesian language primarily spoken in the Philippines by the Ilocano people. It is one of the eight major languages of the Philippines with about 11 million speakers and ranks as the third most widely spoken native language. Iloco serves as a regional lingua franca and second language among Filipinos in Northern Luzon, particularly among the Cordilleran (Igorot) ethnolinguistic groups, as well as in parts of Cagayan Valley and some areas of Central Luzon.

As an Austronesian language, Iloco or Ilocano shares linguistic ties with other Philippine languages and is related to languages such as Indonesian, Malay, Tetum, Chamorro, Fijian, Māori, Hawaiian, Samoan, Tahitian, Paiwan, and Malagasy. It is closely related to other Northern Luzon languages and exhibits a degree of mutual intelligibility with Balangao language and certain eastern dialects of Bontoc language. Iloco is also spoken outside of Luzon, including in Mindoro, Palawan, Mindanao, and internationally in Canada, Hawaii and California in the United States, owing to the extensive Ilocano diaspora in the 19th and 20th centuries. About 85% of the Filipinos in Hawaii are Ilocano and the largest Asian ancestry group in Hawaii. In 2012, it was officially recognized as the provincial language of La Union, underscoring its cultural and linguistic significance.

Bulacan, officially the Province of Bulacan (Tagalog: Lalawigan ng Bulacan; Kapampangan: Lalawigan ning Bulacan; Southern Alta: Lalawigan na Bulacan; Spanish: Provincia de Bulacán), is a province in the Philippines located in the Central Luzon region. Its capital is the city of Malolos. Bulacan was established on August 15, 1578, and part of the Metro Luzon Urban Beltway Super Region. This province is a part of the Greater Manila Area.

It has 572 barangays in 20 municipalities and four component cities (Baliwag, Malolos the provincial capital, Meycauayan, and San Jose del Monte the largest city). Bulacan is located immediately north of Metro Manila. Bordering Bulacan are the provinces of Pampanga to the west, Nueva Ecija to the north, Aurora and Quezon to the east, and Metro Manila and Rizal to the south. Bulacan also lies on the north-eastern shore of Manila Bay.

Bataan (/bɑːtɑːˈʔɑːn/, /bɑːˈtɑːn/, IPA: [bɐtɐˈʔan]), officially the Province of Bataan, is a province in the Central Luzon region of the Philippines. Its capital is the city of Balanga while Mariveles is the largest town in the province. Occupying the entire Bataan Peninsula on Luzon, Bataan is bordered by the provinces of Zambales and Pampanga to the north. The peninsula faces the South China Sea to the west and Subic Bay to the north-west, and encloses Manila Bay to the east.

The Battle of Bataan is known in history as one of the last stands of American and Filipino soldiers before they were overwhelmed by the Japanese forces in World War II. The Bataan Death March was named after the province, where the infamous march started.