Sarso Island
Appearance
Saso Island is off the coast of (and belongs to) Yemen. It is located in the Red Sea at 16.900° North; 41.7° East.
In the 15th Century CE there was a recognised navigation route to the West of the island.
References:
1. http://paleodb.org/cgi-bin/bridge.pl?action=displayCollectionDetails&collection_no=55374
2. Arab Navigation in the Red Sea; G. R. Tibbetts; The Geographical Journal, Vol. 127, No. 3 (Sep., 1961), pp. 322-334