The island of Ivuhos consists entirely of coral
limestone rising in steep cliffs to a height of over . These surround the island, except on the eastern side where the land rises gently from the fringe of sand dunes and small ponds around the shore, in contrast to the
agglomerate cliffs of the island of Sabtang less than distant. The surface of Ibujos is gently rolling, but without any streams or definite stream valleys. This condition is partly due to the solubility of the rock which allows water to run off in underground channels, but it is also in large part an effect of the recent date of the uplift which formed the island, which has not allowed sufficient time for the streams to form valleys. The soil seems to be volcanic ash rather than limestone. The
Philippine Institute of Volcanology and Seismology (PHIVOLCS) classified Ivujos Island (listed as Ibahos Island) as an inactive volcano of the Philippines. An unnamed submarine volcano is located west of Ivujos, which last erupted in 1854. The
seamount rises to just below the water surface. ==See also==