Dos Marmelos River () is a river of Amazonas state in north-western Brazil. It is a tributary of the Madeira River, and merges into this river about upstream from the town of Manicoré.
The headwaters of the river are in the Campos Amazônicos National Park, a protected area created in 2006 that holds an unusual enclave of cerrado vegetation in the Amazon rainforest.
See also List of rivers of Amazonas
References
Brazilian Ministry of Transport