The Sulu Archipelago is a chain of islands in the southwestern Philippines. This archipelago is considered to be part of the Moroland by the local rebel independence movement. This island group forms the northern limit of the Celebes Sea.

The archipelago is not, as is often supposed, the remains of a land bridge between Borneo and the Philippines. Rather, it is the exposed edge of small submarine ridges produced by tectonic tilting of the sea bottom Basilan, Jolo, and other islands in the group are extinct volcanic cones rising from the southernmost ridge. Tawi-Tawi, the southernmost island of the group, has a serpentine basement-complex core with a limestone covering. This island chain is an important migration route for birds.

The largest cities or towns in the area are on Maimbung and Jolo of the Sulu Archipelago, plus the larger island of Palawan to its north, the coastal regions of the westward-extending Zamboanga Peninsula of Mindanao, and the northern part of the island of Borneo were formerly parts of the thalassocratic Sultanate of Sulu and North Borneo.

Sulu (Tausūg: سوگ, Sūg) is an autonomous island province of the Philippines located in the Autonomous Region in Muslim Mindanao (ARMM). Its capital is Jolo and occupies the middle group of islands of the Sulu Archipelago, between Basilan and Tawi-Tawi. It is home to the historical Sultanate of Sulu.

The peaceful advent of Islam around 1138 through merchants and traders had a distinct influence on Southeast Asia. The coming of Arabs, Persians and other Muslims paved the way for the arrival of religious missionaries, traders, scholars and travelers to Sulu and Mindanao in the 12th century.

A landmark born of the social process was the founding of the principality of Buansa Sumatra, who settled there and married the daughter. A decade earlier (1380), Karim-ul-Mahkdum, an Arab religious missionary and learned judge, reinforced the Islamic foundation of Rajah Baguinda’s polity (1390–1460) and that of the Sultanate of Sayid Abubakar, princely scholar from Arabia who married Paramisuli, the daughter of Rajah Baguinda. Sayid Abubakar eventually inherited the rule of Rajah Baguinda, established the Sultanate and became the first Sultan of Sulu. To consolidate his rule, Sayid Abubakar united the local political units under the umbrella of the Sultanate. He brought Sulu, Zamboanga Peninsula, Palawan and Basilan under its aegis.