Apo Reef Light control of the Philippines, all the Spanish plans and records were turned over to the United States. In 1903, the Bureau of Lighthouse Construction proposed to continue the construction of the third-order light on Bajo Apo Island. The tower was found in excellent condition at the warehouse by the Americans together with the tower for Capitancillo Islet in Bogo City, Cebu. A survey party was sent to the station in November 1903 for the topographical surveying of the Island as no work has ever been attempted yet by the Spaniards on this station—unlike in Tanguingui Island or Capitancillo Island where
Apo Reef and is about in depth. Likewise, reef limestone and coralline sand on the east and southeastern sides dominantly underlie the area. The main geographical feature of Apo Reef is submerged, but three islands mark it on the surface: the Apo Island, Apo Menor (locally known as "Binangaan") and Cayos del Bajo ("Keys of the bank", locally known as "Tinangkapan"). The islands are uninhabited. Since the declaration of “no-take-zone” policy at Apo Reef Natural Park in 2007, only protected area personnel and members of the Task Force MARLEN (Marine and Apo Reef Law Enforcement for Nature), who are task to implement