The Arapiuns River is a river in Pará state in north-central Brazil, which It is a tributary of the Tapajós, and merges into the latter river about 30 km (19 mi) before Tapajós merges into the Amazon River. Arapiuns is a blackwater river.
2°18′S 55°00′W / 2.300°S 55.000°W / -2.300; -55.000
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