800meters off the coast of Maragondon in Cavite was one of the defense forts at the entrance to Manila Bay established by the United States.

The long, narrow island is surrounded by sheer cliffs over 30 meters. The whole island and fort has an area of 18 hectares with the highest elevation at 56 meters.

The entire island was designated as Fort Frank, in honor of Brigadier General Royal T. Frank, as part of the Harbor Defenses of Manila and Subic Bays built by the Philippine Department of the US Army in the early 1900s.

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