Zamboanga Peninsula (; Chavacano/Spanish: Península de Zamboanga; ), designated as Region IX, is an administrative region in Mindanao, Philippines. It consists of the provinces of Sulu, Zamboanga del Norte, Zamboanga Sibugay and Zamboanga del Sur, and the cities of Isabela and Zamboanga.
The region was previously known as Western Mindanao. Pagadian serves as the regional center, while Zamboanga City is the region's commercial and industrial center.
Etymology The name of Zamboanga is the Hispanicized spelling of the Sinama term for "mooring place" - samboangan (also spelled sambuangan; and in Subanen, sembwangan), from the root word samboang ("mooring pole"). "Samboangan" was the original name of Zamboanga City, from where the name of the peninsula is derived from. "Samboangan" is well-attested in Spanish, British, French, German, and American historical records from as far back as the 17th century.
This is commonly contested by folk etymologies which instead attribute the name of Zamboanga to the Indonesian word jambangan (claimed to mean "place of flowers", but actually means "pot" or "bowl"), usually with claims that all ethnic groups in Zamboanga were "Malays". However, this name has never been attested in any historical records prior to the 1960s.
History
Ancient era During the ancient era, the Zamboanga peninsula was a vast territory home to various ethnic groups, the largest of which was the Subanen people. Later, the southern coastal areas of the region came under the influence of the Javanese Majapahit Empire, though it was never formally conquered.
Rajahnate of Sanmalan
The 11th-century Chinese Song dynasty records also mention a polity named "Sanmalan" (三麻蘭) from Mindanao, which has a name similar to Zamboanga and has been tentatively identified with it by some authors (Wang, 2008; Huang, 1980). Sanmalan is said to be led by a Rajah "Chülan". His ambassador "Ali Bakti" and that of Butuan's "Likan-hsieh" is recorded to have visited the Chinese imperial court with gifts and trade goods in AD 1011. However, the correlation between Zamboanga and Sanmalan is based only on their similar-sounding names. Sanmalan is only mentioned in conjunction with Butuan (P'u-tuan) and it is unknown if Sanmalan is indeed Zamboanga. The historian William Henry Scott (1989) also posits the possibility that Sanmalan instead referred to a polity of the Sama-Bajau ("Samal") people.
During the 13th century, the Tausūg people began migrating to the Zamboanga Peninsula and the Sulu Archipelago from their homelands in northeastern Mindanao. They became the dominant ethnic group in the archipelago after they were Islamized in the 14th century and established the Sultanate of Sulu in the 15th century. A majority of the Yakan, the Balanguingui, and the Sama-Bajau were also Islamized, though most of the Subanen remained animist (with the exception of the Kolibugan subgroup in southwestern Zamboanga).
Sultanate of Maguindanao era In the 14th century, the Sultanate of Sulu ruled the southwestern sections of the peninsula. By the late 15th century and early 16th century, Malay missionaries further spread Islam in the southern Philippines. Sharif Kabungsuwan, a Johore-born missionary of Malay and Arab descent established the Sultanate of Maguindanao, which the entire island of Mindanao is named after. The sultanate also occupied the entire island except present-day Caraga region, stretching from the Zamboanga Peninsula to Davao Oriental, while the Sultanate of Sulu lost its territories in Zamboanga. Maguindanao's sultans provided Mindanao fierce armed resistance against the Spanish occupation, especially under the lead of Muhammad Kudarat. They soon allied themselves with the Sulu sultanate. The Muslim natives of the region were collectively known as Moros by the Spanish, meaning "Moor", though the Iberian Moors and the Philippine Muslims had little cultural connection outside of following Islam. A large chunk of the Spanish–Moro conflict, the war between the Spanish and Mindanao's Muslim natives took place in the Zamboanga Peninsula.
Spanish rule
In 1569, Zamboanga was chosen as the site of the Spanish settlement and garrison on La Caldera (now called Barrio Recodo). Zamboanga was one of the main strongholds in Mindanao, supporting colonizing efforts in the south of the island and making way for Christian settlements. It also served as a military outpost, protecting the island against foreign invaders and Moro pirates and their Chinese allies. The province, named and centered on Zamboanga City was partly founded by Peruvian soldiers brought by Sebastián Hurtado de Corcuera."SECOND BOOK OF THE SECOND PART OF THE CONQUESTS OF THE FILIPINAS ISLANDS, AND CHRONICLE OF THE RELIGIOUS OF OUR FATHER, ST. AUGUSTINE" (Zamboanga City History) "He (Governor Don Sebastían Hurtado de Corcuera) brought a great reënforcements of soldiers, many of them from Perú, as he made his voyage to Acapulco from that kingdom."
The Zamboanga Peninsula played a central role in the Spanish–Moro conflict. It was the site of constant battling between Spanish soldiers and Moro pirate raids. While the Spanish successfully established churches in the region, they suffered heavily at the hands of Moro raiders, and had to repeatedly withdraw from the region. While the Spanish achieved a tactical victory by launching several attacks against the Sultanate of Sulu, constant fighting and attacks persisted, giving the Moros a psychological victory.
Province of Zamboanga After the United States annexed the Spanish East Indies in 1898, the peninsula hosted a briefly independent state called the Republic of Zamboanga. It was incorporated by the Insular Government into the Moro Province, which consisted of the central and western parts of Mindanao and the Sulu Archipelago. The name and status of Moro Province were changed to the Department of Mindanao and Sulu on August 16, 1916, causing Zamboanga to become a separate province.
In 1942, the Zamboanga Peninsula along with the rest of the Philippine Islands was occupied by the Empire of Japan at the beginning of the Second World War. The Peninsula was liberated in 1945 by joint American and Philippine Commonwealth forces fighting against the Imperial Japanese Army.
On June 6, 1952, the province was partitioned into Zamboanga del Norte and Zamboanga del Sur, while the chartered city of Zamboanga became part of Zamboanga del Sur.
Region Together with the Sulu Archipelago, the provinces that formerly made up Zamboanga Province were re-organised into Region IX by order of Presidential Decree No. 1 as part of the Integrated Reorganization Plan of President Ferdinand Marcos, that was signed on September 24, 1972.
From 1975 to 1989, the old Region IX (Western Mindanao) was further divided into two sub-regions by Presidential Decree No. 8233 dated August 21, 1975. Sub-Region IX-A consisted of Basilan, Sulu and Tawi-Tawi with Jolo, Sulu, as the sub-regional center, while Sub-Region IX-B consisted of the provinces of Zamboanga del Norte, Zamboanga del Sur and Zamboanga Sibugay, with the chartered city of Zamboanga City as the sub-regional centre.
Present In 2001, Zamboanga Sibugay, was created from the province of Zamboanga del Sur with Ipil as the seat of government with the virtue of Republic Act No. 8973. In the same year, the residents of Basilan opted to join the Autonomous Region in Muslim Mindanao (ARMM) in a plebiscite. However, the citizens of the capital, Isabela, did not want to join so the city remained a part of this region as a result of Executive Order No. 36.
Isabela also opted out of inclusion to the Bangsamoro region during the 2019 plebiscite.
After a 2024 ruling which invalidated Sulu's inclusion to the Bangsamoro region, the Commission on Elections en banc proposed of the province's re-admission to the Zamboanga Peninsula, the region it belonged prior to its inclusion in the ARMM back in 1989. Sulu reverted to Zamboanga Peninsula by virtue of Executive Order No. 91, signed by President Bongbong Marcos on July 30, 2025.
Regional center issue In 1978, Presidential Decree No. 1555 transferred Region IX's regional center from Jolo, Sulu to Zamboanga City.
Executive Order (EO) No. 429 was issued in 1990 by President Corazon Aquino which provided for the reorganization of the administrative regions in Mindanao. It declared that Western Mindanao would comprise Zamboanga City, Lanao del Norte, Misamis Occidental, Zamboanga del Sur, Zamboanga del Norte, Basilan, and the cities comprising those provinces. It also declared that Pagadian shall serve as the new regional center.
In 1996, President Fidel Ramos issued EO No. 325 which reorganized the Regional Development Councils. The Implementing Rules and Regulations of EO No. 325 provided that Zamboanga City is the regional center of Western Mindanao.
In 2001, President Gloria Macapagal Arroyo signed EO No. 36 which reorganized and renamed Western Mindanao to Zamboanga Peninsula. It was silent on the issue of regional government centers.
In 2004, Memorandum Circular (MC) No. 75 directed the transfer of regional offices from Zamboanga City to Pagadian citing EO No. 429 as its legal basis. However, it provided that the regional offices of the departments of Trade and Industry, Tourism, and Labor and Employment will remain in Zamboanga City, but shall establish a presence in Pagadian.
On December 22, 2010, MC No. 11 was issued imposing a moratorium on the transfer of regional offices to Pagadian. The Circular cited the high economic and social costs that the employees were experiencing in maintaining two residences and in fully transferring to Pagadian. It further directed all regional offices that are already in Pagadian to continue their operations.
On June 30, 2020, MC No. 78 was issued, repealing MC No. 11 and lifting the moratorium on the transfer of the remaining regional offices to Pagadian. The Circular affirmed that Pagadian is the regional government center while Zamboanga City is the commercial and industrial center of Region IX.
On April 19, 2023, under MC No. 18, another moratorium was imposed on the transfer of regional offices to Pagadian pending further study of its implications. The regional offices that are already in Pagadian shall continue to operate thereat.
Geography The region is located on the western part of the island of Mindanao, that lies between the Moro Gulf (part of the Celebes Sea) and the Sulu Sea. Along the shores of the peninsula are numerous bays and islands of varying sizes. The peninsula is connected to the rest of Mindanao through an isthmus situated between Panguil Bay and Pagadian Bay.
The region surrounds the province of Misamis Occidental on the northeastern corner of the geographic peninsula, though it is part of Northern Mindanao.
Administrative divisions Provinces
Zamboanga Peninsula comprises four provinces, one highly urbanized city, four component cities, 86 municipalities and 2,314 barangays.
Province Capital Population Area Density Cities km2 sq mi /km2 /sq mi Jolo 0 19 410 Dipolog City 2 25 691 Pagadian City 1 26 681 Ipil 0 16 389 † — 1 — 98 ‡ — 1 — 45 Total 4,875,684 18,504.43 5 86 2,314
Governors and vice governors ProvinceImageGovernorPolitical partyVice governor Abdusakur A. Tan II Abdusakur M. Tan Darel Dexter T. Uy Julius C. NapigquitDivina Grace C. Yu Roseller Ariosa Dulce Ann K. Hofer Richard D. Olegario
Cities
Dapitan is one of the two cities of Zamboanga del Norte. Known as the "Shrine City in the Philippines", this was where José Rizal, the national hero of the country, was exiled. It is also known for the old St. James Parish and the beach resort of Dakak.