|Native name||Rio Pasimoni (Spanish)|
|River system||Rio Negro|
The Pasimoni forms on the northern slope of the Cerro de la Neblina and flows northward to Casiquiare canal. It surrounded by low, poorly drained country. It drains a heavily forested region where the driest months are December to February, but rain is common in the dry season. It is a classic blackwater river with low pH, conductivity, solute and nutrients.