The Indian Ocean is included on the Fra Mauro map.
 The ridges of the Indian Ocean form ranges of seamounts, sometimes very long, including the Carlsberg Ridge, Madagascar Ridge, Central Indian Ridge, Southwest Indian Ridge, Chagos-Laccadive Ridge, 85E Ridge, 90E Ridge, Southeast Indian Ridge, Broken Ridge, and East Indiaman Ridge
 Madagascar and the Southwest Indian Ridge separate three cells south of Madagascar and off South Africa

