Sipadan is the only oceanic island in Malaysia, rising 600 metres (2,000 ft) from the seabed. It is located in the Celebes Sea off the east coast of Sabah, Malaysia. It was formed by living corals growing on top of an extinct volcanic cone that took thousands of years to develop. Sipadan is located at the heart of the Indo-Pacific basin, the centre of one of the richest marine habitats in the world. More than 400 species of fish and hundreds of coral species have been classified in this ecosystem. Sipadan Island was at the top of Rodale's Scuba Diving Magazine Gold List for 'The Top Dive Destination in the World'. In fact it shared its top spot with 2 other destinations known for the diversity of their marine life — the Galápagos Islands of Ecuador and Truk in Micronesia. Furthermore, one of the dive operators; Scuba Junkie was voted by the public the "Best Dive Resort in the World 2020" at DiveMagazine's annual Dive Travel Awards.

Abu Sayyaf, officially known by the Islamic State as the Islamic State – East Asia Province, is a Jihadist militant and pirate group that followed the Wahhabi doctrine of Sunni Islam. It was based in and around Jolo and Basilan islands in the southwestern part of the Philippines, where for more than five decades, Moro groups had been engaged in an insurgency seeking to make Moro Province independent. The group was considered violent and was responsible for the Philippines' worst terrorist attack, the bombing of MV Superferry 14 in 2004, which killed 116 people. The name of the group was derived from Arabic abu, and sayyaf. As of April 2023, the group was estimated to have about 20 members, down from 1,250 in 2000. They used mostly improvised explosive devices, mortars and automatic rifles.