Banc du Geyser
Banc du Geyser ( also Banc du Geysir ) is a mostly submerged reef in the Mozambique Channel's northeastern part , northeast from Mayotte , southwest of the Glorioso Islands , and off the northwestern coast of Madagascar . 
<triplet> Banc du Geyser <subj> reef <obj> instance of <triplet> Mayotte <subj> Madagascar <obj> shares border with <triplet> Glorioso Islands <subj> Mozambique Channel <obj> located in or next to body of water