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Southeast Asian first-level subdivisions

228 articles

Terengganu (ترڠݢانو)

Terengganu (ترڠݢانو), Terengganu Darul Iman, is a sultan-ruled Malaysian state on the east coast of Peninsular Malaysia: 1,149,440 people (2020), capital Kuala Terengganu, 1911 self-government law, RM40.6 billion GDP in 2025.

Thừa Thiên Huế province

Thừa Thiên Huế (tỉnh Thừa Thiên Huế) was a North Central Coast Vietnamese province; from 1 January 2025 its entire territory became the centrally governed city of Huế under Resolution 175/2024/QH15, with a two-tier ward structure from July 2025.

Tỉnh Cao Bằng

Cao Bằng Province (tỉnh Cao Bằng), a mountainous northeastern Vietnamese province bordering China's Guangxi over 311 km; area 6,700.4 km², kept unchanged in the 2025 mergers, 56 communes/wards since July 2025, home to Ban Gioc and Non Nuoc Geopark.

Tỉnh Ðiện Biên

Điện Biên (Dien Bien) province, Northwest Vietnam; only province bordering both Laos and China (over 455 km). Area 9,539.93 km², 673,091 people, 45 commune-level units, site of the 1954 Battle of Dien Bien Phu.

Tỉnh Lạng Sơn

Tỉnh Lạng Sơn (Lang Son Province), northeastern Vietnam border province on the 231-km Guangxi frontier; capital Lang Son; Huu Nghi and Dong Dang international gates, UNESCO Global Geopark 2024, unchanged in 2025 reorganization.

Tỉnh Nghệ An

Nghệ An is a coastal province in north central Vietnam and, until the 2025 provincial reorganization, the country's largest by area; its capital is Vinh and it is the birthplace of Hồ Chí Minh.

Tỉnh Quảng Ninh

Tỉnh Quảng Ninh (Quang Ninh Province), northeastern Vietnamese province formed 30 October 1963 from Hai Ninh and Hong Quang; named by Ho Chi Minh; became centrally governed Quang Ninh City on 1 September 2026 under Resolution 36/2026/QH16.

Uttaradit

Uttaradit (อุตรดิตถ์), a province in lower northern Thailand on the Nan River; name means port of the north; 7,838.59 km², 9 districts, about 389,300 people (2025), home to Sirikit Dam, Thailand's largest earth dam.

Vientiane Prefecture

Vientiane Prefecture (Lao: Nakhônlouang ViangChan), also called Vientiane Capital, is the single prefecture of Laos, containing the national capital on a curve of the Mekong River bordering Thailand.

Vientiane Province

Vientiane Province is a province of Laos in the country's center, about 70 kilometers north of Vientiane Capital, a separate unit, with 11 districts and Viengkham as its capital.

West Java

West Java (Jawa Barat), Indonesia's most populated province with 18% of the national population, faces high internal development inequality: Williamson Index averaging 0.7180 (2015-2024) and a Gini ratio of 0.428 in 2022.

West Nusa Tenggara

West Nusa Tenggara (Nusa Tenggara Barat, NTB) is an Indonesian province of Lombok and Sumbawa, capital Mataram, formed 17 December 1958, home to Sasak, Samawa, and Mbojo cultures and the volcanoes Rinjani and Tambora.

West Papua (province)

West Papua (Provinsi Papua Barat) is an Indonesian province on western New Guinea, capital Manokwari. Created 1999 as Irian Jaya Barat, renamed 2007, split in 2022 when Southwest Papua province was carved out; a designated Conservation Province.

West Sulawesi

West Sulawesi (Sulawesi Barat, Sulbar), an Indonesian province on western Sulawesi island, capital Mamuju, created 5 October 2004 from South Sulawesi; six regencies, 1.55 million people, agriculture-led economy growing 5.36% in 2025.

Western Visayas

Western Visayas (Region VI) is a Philippine administrative region in the western Visayas, now five provinces plus Iloilo City after Negros Occidental moved to the Negros Island Region in 2024; population 4,861,911 (2024).

Xaignabouli

Xaignabouli (Sainyabuli, ໄຊຍະບູລີ) is a province of northwestern Laos, capital Xaignabouli town, 16,389 km², 11 districts, 645-km Thai border, largest elephant population in Laos, Xayaburi Dam site.

Zambales

Zambales is a first-class province in Central Luzon, Philippines, capital Iba, 13 municipalities, 681,225 people (2024). Known for nickel and chromite mining in Santa Cruz, 5.0% economic growth in 2023, and coastal flooding.

Zamboanga Peninsula

Zamboanga Peninsula (Region IX), formerly Western Mindanao, is a Philippine administrative region in southwestern Mindanao with provinces Zamboanga del Norte, Zamboanga del Sur, Zamboanga Sibugay, and Sulu; regional center Pagadian City.