Barnafoss (Icelandic pronunciation: [ˈpa(r)tnaˌfɔsː]), also known as Bjarnafoss [ˈpja-], is a waterfall in Western Iceland on the river Hvítá in Borgarfjörður, about 100 kilometres (62 mi) from Reykjavík. Located directly upstream from Hraunfossar, the two waterfalls flow out of the Hallmundarhraun lava field.