Both the mouth of the Atran and which sea flow into Kattegat?
Ätran (river) Ätran is a Swedish river. The river is about 240 km long, and has its source in Gullered, Västergötland, at a height of 332 m above sea level. The river has its mouth in Falkenberg, Halland, where the river enters Kattegat.
Mananara River The Mananara River is one of the main rivers in eastern Madagascar. Its mouth is located at the Indian Ocean near the city of Vangaindrano in the Atsimo-Atsinanana region.