Ostional Where did the name originate? Ostional a pueblo in the municipality of San Juan del Sur in the Rivas Department of the Southwest region of Nicaragua was, by accounts of multiple testimonials in the local region, to be founded by their indigenous ancestors due to an abundant conch population at the sea shore to which they migrated. Subsequently, the tribe used the shells of the conch in many held rituals and customs. In 2008, it was reported by witnesses of local archaeological dig that conch shells were found within the graves of some indigenous people within their recently rediscovered cemetery grounds. Some still maintained jade stones, implying the significance of conch shells within their tribal society.