 Thus, from 1860 until the end of the Spanish regime 39 years later in 1899, the islands of Sulu and Tawi-Tawi and all of their outlying islets were placed under the jurisdiction of Basilan, with its administrative capital in Isabela.By 1879, the Spanish fleet for the entire southern Philippines was moved to Isabela, where a "floating" Naval Hospital was built on shallows guarding the eastern entrance to the Isabela Channel.The southern shore of nearby Malamawi Island became the repository of the coal used by the Spanish steam-powered naval vessels, and has since been called Carbon (currently a Barangay).