Maritime Southeast Asia

Indonesia, officially the Republic of Indonesia, is a country in Southeast Asia and Oceania, between the Indian and Pacific oceans. Comprising over 17,000 islands, including Sumatra, Java, Sulawesi, and parts of Borneo and New Guinea, Indonesia is the world's largest archipelagic state and the 14th-largest country by area, at . Indonesia has significant areas of wilderness that support one of the world's highest levels of biodiversity. It shares land borders with Papua New Guinea, Timor-Leste, and Malaysia, as well as maritime borders with seven other countries, including Australia, Singapore,

The Philippines, officially the Republic of the Philippines, is an archipelagic country in Southeast Asia. Located in the western Pacific Ocean, it consists of about 7,641 islands, with a total area of about 300,000 square kilometers, which are broadly categorized in three main geographical divisions from north to south: Luzon, Visayas, and Mindanao. With a population of over 112 million, it is the world's fourteenth-most-populous country.

Singapore, officially the Republic of Singapore, is an island country and city-state in Southeast Asia. Its territory comprises a main island, over 60 satellite islands and islets, and one outlying islet. The country is about one degree of latitude () north of the equator, off the southern tip of the Malay Peninsula, bordering the Strait of Malacca to the west, the Singapore Strait to the south along with the Riau Islands in Indonesia, the South China Sea to the east and the Straits of Johor along with the State of Johor in Malaysia to the north.

Brunei, officially Brunei Darussalam, is a country in Southeast Asia, situated on the northern coast of the island of Borneo. Apart from its coastline on the South China Sea, it is completely surrounded by the Malaysian state of Sarawak, with its territory bifurcated by the Sarawak district of Limbang. Brunei is the only sovereign state entirely on Borneo; the remainder of the island is divided between its multi-landmass neighbours of Malaysia and Indonesia. , the country had a population of 466,330, of whom approximately 64,409 resided in the capital and largest city of Bandar Seri Begawan. I

Timor-Leste, also known as East Timor, officially the Democratic Republic of Timor-Leste, is a country in Southeast Asia. It comprises the eastern half of the island of Timor, the coastal exclave of Oecusse in the island's northwest, and the islands of Atauro and Jaco, for a total land area of . Timor-Leste shares a land border with Indonesia to the west; Australia is the country's southern neighbour, across the Timor Sea. Dili, on the north coast of Timor, is its capital and largest city.

Java is one of the Greater Sunda Islands in the South East Asian country of Indonesia. It is bordered by the Indian Ocean to the south and the Java Sea (a part of Pacific Ocean) to the north. With a population of 156.9 million people (including Madura) in mid 2024, projected to have risen to 158 million by mid-2025, Java is the world's most populous island, home to approximately 56% of the Indonesian population while constituting only 7% of its land area. Indonesia's capital city, Jakarta, is on Java's northwestern coast.

Sumatra () is one of the Sunda Islands of western Indonesia. It is the largest island that is fully within Indonesian territory, as well as the sixth-largest island in the world at 482,286.55 km2 (182,812 mi.2), including adjacent islands such as Simeulue, Nias, the Mentawai Islands, Enggano, the various achipelagoes comprising the Riau Islands Province, Bangka and Belitung and the Krakatoa archipelago.

Borneo () is the third-largest island in the world, with an area of , and population of 23,053,723 (2020 national censuses). Situated at the geographic centre of Maritime Southeast Asia, it is one of the Greater Sunda Islands, located north of Java, west of Sulawesi, and east of Sumatra. The island is crossed by the equator, which divides it roughly in half. In Indonesia, the island is also known as Kalimantan, which is also the name of the Indonesian region located on the island.

Marginal sea in the Pacific Ocean

Sulawesi ( , ), also known as Celebes ( ), is an island in Indonesia. One of the four Greater Sunda Islands, and the world's 11th-largest island, it is situated east of Borneo, west of the Maluku Islands, and south of Mindanao and the Sulu Archipelago. Within Indonesia, only Sumatra, Borneo, and Papua are larger in territory, and only Java and Sumatra are more populous.

Aceh ( , ; , ; Jawoë: ; Old Spelling: Atjeh) is the westernmost province of Indonesia. It is located on the northern end of Sumatra island, with Banda Aceh being its capital and largest city. It is bordered by the Indian Ocean to the west, Strait of Malacca to the northeast, as well bordering the province of North Sumatra to the east, its sole land border, and shares maritime borders with Malaysia and Thailand to the east, and Andaman and Nicobar Islands of India to the north. Granted a special autonomous status, Aceh is a religiously conservative territory, with the majority of the population

archipelago in eastern Indonesia, also called the Spice Islands

sea of the Indian Ocean

strait between the Malay Peninsula and the Indonesian island of Sumatra

shallow sea between Java and Borneo, in Indonesia

Sarawak ( , ) is a state of Malaysia. It is the largest of the 13 states, with an area almost equal to that of Peninsular Malaysia. Sarawak is in East Malaysia, in northwest Borneo, and is bordered by the Malaysian state of Sabah to the northeast, Kalimantan (the Indonesian portion of Borneo) to the south, and Brunei to the north. The state capital, Kuching, is Sarawak's largest city, its economic centre, and the seat of the state government. Other cities and towns in Sarawak include Miri, Sibu, and Bintulu. As of the 2020 Malaysia census, Sarawak's population was 2.453 million. Sarawak has an

group of islands in the southern Indonesian Archipelago

Sabah () is a state of Malaysia located in northern Borneo, in the region of East Malaysia. Sabah has land borders with the Malaysian state of Sarawak to the southwest and Indonesia's North Kalimantan province to the south. The Federal Territory of Labuan is an island just off Sabah's west coast. Sabah shares maritime borders with Vietnam to the west and the Philippines to the north and east. Kota Kinabalu is the state capital and the economic centre of the state, and the seat of the Sabah State government. Other major towns in Sabah include Sandakan and Tawau. The 2020 census recorded a popul

shallow inlet in the western part of the South China and Eastern Archipelagic Seas

archipelago between mainland Southeast Asia and Australia

Interisland Sea in the Pacific Ocean

western part of the Malayo-Indonesian Archipelago

Interisland Sea in the Pacific Ocean

Kalimantan () is the Indonesian portion of the island of Borneo. It constitutes 73% of the island's area, and consists of the provinces of Central Kalimantan, East Kalimantan, North Kalimantan, South Kalimantan, and West Kalimantan. The non-Indonesian parts of Borneo are Brunei and East Malaysia. In Indonesia the whole island of Borneo is also called "Kalimantan".

Dutch colony in Southeast Asia and Oceania (1800–1949)

archipelago in the Bay of Bengal

ethnic group native to eastern Sumatra, the Malay Peninsula, the Riau Islands and the coast of Borneo

Interisland Sea in the Pacific Ocean

The Visayas ( ), or the Visayan Islands (Visayan: Kabisay-an, ; Filipino: Kabisayaan ), are one of the three principal geographical divisions of the Philippines, along with Luzon and Mindanao. Located in the central part of the archipelago, it consists of several islands, primarily surrounding the Visayan Sea, although the Visayas are also considered the northeast extremity of the entire Sulu Sea. Its inhabitants are predominantly the Visayan peoples.

sea in Indonesia located in the western Pacific Ocean

group of reefs, islets, atolls, cays and islands

Labuan (), officially the Federal Territory of Labuan (), is an island federal territory of Malaysia. It includes and six smaller islands off the coast of the state of Sabah in East Malaysia. Labuan's capital is Victoria, which is best known as an offshore financial centre offering international financial and business services via Labuan IBFC since 1990, as well as being an offshore support hub for deepwater oil and gas activities in the region. It is also a tourist destination for people travelling through Sabah, nearby Bruneians, and scuba divers. The name Labuan derives from the Malay word

group of four islands in the Malayo-Indonesian Archipelago

island group in the Indian Ocean

body of water located off the coast of northern Vietnam and southern China, northern arm of the South China Sea

sea in Indonesia

region encompassing South (Em(Indian subcontinent) and Southeast Asia

species of mammal

Interisland Sea in the Pacific Ocean

group of islands, reefs, banks and other maritime features in the South China Sea

strait between Indonesia, Malaysia and Singapore

sea in the Philippines

part of Malaysia located on the island of Borneo

Interisland Sea in the Pacific Ocean

archipelago in the Philippines

Spanish territory in Asia-Pacific from 1565 until 1901

Portuguese colony, now known as East Timor (Timor-Leste), an independent country

historic sultanate state based on the islands of Sulu, Palawan, and northeastern Borneo

sea in the Philippines

thumb|upright=1.6|Wallacea is the group of islands within the red area. The Max Carl Wilhelm Weber|Weber Line in blue has been used to separate Wallacea into a western part pertaining to [[Asia and an eastern part pertaining to Oceania.]] upright=1.6|thumb|The Sunda Shelf|Sunda and Sahul shelves. Wallacea is the area in between.

former British protectorate, nowadays transformed as Sabah

group of islands in the Philippines

roughly triangular area of the tropical marine waters of Indonesia, Malaysia, Papua New Guinea, Philippines, Solomon Islands and Timor-Leste

Old Javanese term for the archipelagic Majapahit territory

archipelago

former sultanate in the Philippines

maritime region of Southeast Asia as opposed to mainland Southeast Asia, mainly comprising the Indonesian-Philippines archipelago

strait connecting Leyte Gulf and Bohol Sea in the Philippines

Southeast Asian pseudo-feudalistic political model between 5th to 15th century

extension of the continental shelf of Southeast Asia