Romblon is an archipelagic province of the Philippines located in the Mimaropa region. Its main islands include Tablas, the largest, which covers nine municipalities, Sibuyan with its three towns, as well as the smaller island municipalities of Corcuera, Banton, Concepcion, San Jose, and Romblon, the provincial capital. The province lies south of Marinduque and Quezon, east of Oriental Mindoro, north of Aklan and Capiz, and west of Masbate. According to the 2015 census, it has a total population of 292,781.

Romblon has been inhabited by aboriginal Filipinos prior to the arrival of the Spanish in 1569. Archaeological artifacts recovered by the National Museum in 1936 indicate that the aborigines of Romblon already have a rich and advanced culture. Under Spanish colonial rule, Romblon was initially administered under the newly established province of Arevalo, until 1716, when it was transferred to the jurisdiction of the newly created province of Capiz. With the arrival of the Americans in 1901, Romblon was declared a province and placed under civilian rule. It lost its provincial status for a short while between 1907 and 1945, but regained it in 1946, just after World War II.

The inhabitants of Romblon are divided into three ethnolinguistic groups: Romblomanon, Onhan and Asi. These groups occupy specific islands in the province and have their own language and customs. Romblomanon is mainly spoken in the town of Romblon, in all of three towns of Sibuyan Island, and the towns of San Andres and San Agustin in Tablas Island. Onhan is mainly spoken in the municipalities in the southern part of Tablas Island Alcantara, Looc, Ferrol, Santa Fe and Santa Maria well as in the island municipality of San Jose. The northwestern part of Tablas Island in Odiongan and Calatrava, as well as the islands municipalities of Corcuera, Banton, and Concepcion, speak the Asi language.

Currently, the province relies on agriculture, particularly rice and copra farming as well as fishing, for its livelihood. It also has a lucrative marble industry due to an abundance of Italian-quality marble, hence, its moniker as the "Marble Capital of the Philippines." In recent years, the province has also become an ecotourism destination, with several white sand beaches, diving spots, mountains and rainforests that tourists visit annually.

Palawan is an island province of the Philippines that is located in the Mimaropa region. It is the largest province in the country in terms of total area of jurisdiction. Its capital is Puerto Princesa City, but it is governed independently from the province.

The islands of Palawan stretch between Mindoro in the northeast and Borneo in the southwest. It lies between the South China Sea and the Sulu Sea. The province is named after its largest island, Palawan Island (09°30′N 118°30′E), measuring 450 kilometres (280 mi) long, and 50 kilometres (31 mi) wide.

As of September 2016, Palawan Island is rated the "Most Beautiful Island in the World" as voted by respective readers of rival travel publications Conde Nast Traveller and Travel + Leisure. It is the second year running that Palawan has won the Conde Nast Traveller award, as well as the second time in four years that it has occupied Travel + Leisure's top spot (2013). El Nido, located at the northern tip of the island, is also currently rated the "Most Beautiful Beach in the World" by Conde Nast Traveller readers.

Marinduque is an island province in the Philippines located in Mimaropa (Region IV-B) region. Its capital is the municipality of Boac. Marinduque lies between Tayabas Bay to the north and Sibuyan Sea to the south. It is west of the Bondoc Peninsula of Quezon province; east of Mindoro Island; and north of the island province of Romblon.

The province of Marinduque resided by its peace-loving people was ranked number 1 by the Philippine National Police and Philippine security forces as the 2013 Most Peaceful Province of the country due to its low crime rate statistics alternately ranking with the province of Batanes yearly. Furthermore, for almost 200 years, the province is home to one of the oldest religious festivals of the country: the unique and colorful Moriones Festival celebrated annually every Holy Week.

Occidental Mindoro is a province in the Philippines located in the Mimaropa region. Its capital is Mamburao and occupies the western half of the island of Mindoro.

The province is bordered on the east by the province of Oriental Mindoro, and on the south by the Mindoro Strait. The South China Sea is to the west of the province and Palawan is located to the southwest, across the Mindoro Strait. Batangas is to the north, separated by the Verde Island Passage.

Oriental Mindoro is a province in the Philippines located in the island of Mindoro under Mimaropa region in Luzon, about 140 kilometres (87 mi) southwest of Manila.

The province is bordered by the Verde Island Passage and the rest of Batangas to the north, by Marinduque, Maestre de Campo (or known as Sibale but official name is Concepcion) Island, Tablas Strait and the rest of Romblon to the east, by Semirara and the rest of Caluya Islands, Antique to the south, and by Occidental Mindoro to the west. Calapan, the only city in the island, is the provincial capital.

Oriental Mindoro is touted as the country's emerging eco-tourism destination. In 2005, the Philippines was found to be the center of marine fish biodiversity and the home of the most diverse marine ecosystem in the world, by American biologists Kent Carpenter and Victor Springer. Most of the endemic species in the Philippines are found in the Verde Island Passage between Mindoro island and the main island of Luzon. The passage houses 2,983 individual species of algae, corals, crustaceans, mollusks, fishes, marine reptiles, and marine mammals, based on a study conducted by Carpenter and Springer in 2005War II.

UNESCO declared Puerto Galera a biosphere reserve under its Man and the Biosphere Programme in the 1970s. The Verde Island Passage is at the apex of the so-called Coral Triangle – the Philippines, Indonesia, and Malaysia – which has the distinction of being the "global center of marine biodiversity".