en: The Marañón River ( formerly known as Sumatara ) is a large tributary of the Pastaza River in the northwestern Amazon - South American basin . The Marañón River ( formerly known as the Sumatara ) is a large tributary to the Pastaza River in the northwestern Amazon Basin of South America .
ms: Sungai Maran (dahulu dikenali sebagai Sumatara) adalah anak sungai besar Sungai Pastaza di barat laut Amazon-Asia Selatan lembangan. Sungai Maran (dahulu dikenali sebagai Sumatara) adalah anak sungai besar ke Sungai Pastaza di Lembangan Amazon barat laut Amerika Selatan.