Reigolil River (Spanish: Río Reigolil, Spanish pronunciation: [rejˈɣolil]) is the main tributary to Trancura River in La Araucanía Region, Chile.

[1] Reigolil River flows from north to south following the Reigolil-Pirihueico Fault.

The river has a catchment area that includes the southern slopes of Sollipulli Volcano in the north and a large portion of land east of Huerquehue National Park.

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