Assertion: country's region | /r/HasProperty | the island arc
Facets:
Source sentences:
text: The only active volcanic region is the island arc aligned with Mount Cameroon (13,353 feet [4,070 metres]) on the coast of the Cameroon Republic; the islands of this arc (Bioko [Fernando Po], Príncipe, São Tomé, and Annobón) extend 450 miles (724 km) offshore to the southwest.