Reigolil River (, ) is the main tributary to Trancura River in La AraucanÃÂa Region, Chile. 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.