Rizal (province) in the context of Sierra Madre (Philippines)

Central Bikol, commonly called Bikol Naga or simply Bikol, is an Austronesian language spoken by the Bicolanos, primarily in the Bicol Region of southern Luzon, Philippines. It is spoken in the northern and western part of Camarines Sur, the second congressional district of Camarines Norte, the eastern part of Albay, the northeastern part of Sorsogon, San Pascual town in Masbate, and the southwestern part of Catanduanes. Central Bikol speakers can be found in all provinces of Bicol, and it is a majority language in Camarines Sur. The standard sprachraum form is based on the Canaman dialect. The language has also speakers outside their native regional homeland, especially in Metro Manila, Mindoro, Palawan, and Mindanao (particularly in Mati, Davao Oriental)

Central Bikol features some vocabulary not found in other Bikol languages nor in other members of the Central Philippine language family like Tagalog and Cebuano. Examples are the words matua and bitis, which are the same as the Kapampangan words meaning 'older' and 'foot, feet', respectively. The word banggi ('night') is another example of this as it is different from the usual Bikol word gab-i but closer to the word bengi of Kapampangan. There is no formal study on the relationship of the Central Luzon languages to Central Bikol but the latter has several words that are also found in the archaic form of Tagalog spoken in the Rizal and Quezon provinces that are believed to be the home of Central Luzon languages such as Kapampangan in Pampanga and southern Tarlac, and Sambalic languages in Zambales province.

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.

Calabarzon (officially stylized in all caps; English: /ˌkɑːləbɑːrˈzɒn/; Tagalog: [kalɐbaɾˈsɔn]), sometimes referred to as Southern Tagalog (Tagalog: Timog Katagalugan) and designated as Region IV‑A, is an administrative region in the Philippines. It is situated southeast of Metro Manila and is bordered by Manila Bay and the South China Sea to the west, Lamon Bay and the Bicol Region to the east, Tayabas Bay and the Sibuyan Sea to the south, and Central Luzon to the north. Comprising five provinces—Cavite, Laguna, Batangas, Rizal, and Quezon (hence the acronym)—and one highly urbanized city, Lucena, it is the most populous region in the Philippines, according to the 2020 census, with over 16.1 million inhabitants. It is also the country's second most densely populated region, after the National Capital Region. Calamba in Laguna serves as the regional center, while Antipolo in Rizal is the most populous city in the region.

Before its creation as a separate region, Calabarzon, along with the Mimaropa region, the province of Aurora, and parts of Metro Manila, comprised the historical region known as Southern Tagalog until they were separated in 2002 through Executive Order No. 103.

Caloocan, officially the City of Caloocan (Filipino: Lungsod ng Caloocan; IPA: [kalɔˈʔokan]), is a city in Metro Manila, Philippines. According to the 2024 census, it has a population of 1,712,945 people, making it the fourth-most populous city in the Philippines.

Caloocan is divided into two geographical locations with a total combined area of 5,333.40 hectares (13,179.1 acres), a result of the 1949 expansion of Quezon City, which absorbed much of its territory. It was formerly part of the Province of Rizal in southern Luzon. It comprises what is known as the CAMANAVA area along with the cities of Malabon, Navotas and Valenzuela.

Marikina (/mərɪˈkɪnə/), officially the City of Marikina (Filipino: Lungsod ng Marikina), is a highly urbanized city in the National Capital Region of the Philippines. According to the 2024 census, it has a population of 471,323 people.

Located along the eastern border of Metro Manila, Marikina is the main gateway of Metro Manila to Rizal and Quezon through the Marikina–Infanta Highway. It is bordered on the west by Quezon City, to the south by Pasig and Cainta, to the north by San Mateo, and to the east by Antipolo, the capital of Rizal province.

Pasig, officially the City of Pasig (Filipino: Lungsod ng Pasig), is a highly-urbanized city in the National Capital Region of the Philippines. According to the 2024 census, it has a population of 853,050 people.

It is located along the eastern border of Metro Manila with Rizal province, the city shares its name with the Pasig River. A formerly rural settlement, Pasig is primarily residential and industrial, but has been becoming increasingly commercial in recent years, particularly after the construction of the Ortigas Center business district in its west. The city is home to the Roman Catholic Diocese of Pasig, based in Pasig Cathedral, a landmark built around the same time as the town's foundation in 1573.

San Mateo, officially the Municipality of San Mateo (Tagalog: Bayan ng San Mateo), is a municipality in the province of Rizal, Philippines. According to the 2024 census, it has a population of 276,449 people.

Conurbated to the urban agglomeration of the Greater Manila Area, San Mateo is one of the fastest-growing municipalities in Rizal Province, according to the Metropolitan Manila Development Authority (MMDA) and the Provincial Government of Rizal. It is a commuter hub to Metro Manila.

Rodriguez, officially the Municipality of Rodriguez (Tagalog: Bayan ng Rodriguez) and still commonly known by its former name Montalban, is a municipality in the province of Rizal, Philippines. According to the 2024 census, it has a population of 451,383 people, making it the most populous municipality in the country.

The town is one of the richest municipalities in the country, ranking third in 2016 with an income of ₱691 million.

Quezon, officially the Province of Quezon (Tagalog: Lalawigan ng Quezon) and historically known as Tayabas, is a province in the Philippines located in the Calabarzon region on Luzon. Lucena, a highly urbanized city governed separately from the province, serves as the provincial capital and its most populous city. The name of the province came from Manuel L. Quezon, the president of the Philippines from 1935 to 1944 and a native of Baler, which was formerly a part of the province. The province was known as Kalilayan upon its creation in 1591, renamed as Tayabas by the 18th century, before settling on its current name in 1946. To distinguish the province from Quezon City, it is also known as Quezon Province, a variation of the province's official name.

One of the largest provinces in the country, Quezon is situated on the southeastern portion of Luzon, with the majority of its territory lying on an isthmus that connects the Bicol Peninsula to the rest of Luzon. It also includes the Polillo Islands in the eastern part of the province. It is bordered by the provinces of Aurora and Bulacan to the north, Rizal, Laguna, and Batangas to the west, and Camarines Norte and Camarines Sur to the southeast. It also shares maritime borders with Marinduque and Masbate.

Navotas, officially the City of Navotas (Filipino: Lungsod ng Nautas), is a highly urbanized city in the National Capital Region of the Philippines. According to the 2024 census, it has a population of 252,878 people.

It was formerly part of the Province of Rizal in southern Luzon. It comprises what is known as the CAMANAVA area along with the cities of Caloocan, Malabon, and Valenzuela.