Located in: [[Black Sea]], [[Sea of Marmara]]. The [[Bosporus]] or [[Bosporus|Bosphorus Strait]] is a natural strait and an internationally significant waterway located in [[Turkey]]. The [[Bosporus]] connects the [[Black Sea]] to the [[Sea of Marmara]] and forms one of the continental boundaries between [[Asia]] and [[Europe]]. It is the world's narrowest strait used for international navigation.