Sol Duc Falls, Washington. It flows from the ... Sol Duc Falls, Washington. It flows from the Olympic National Forest to the broad Sol Duc Valley. About 78 miles long. 📷@andrewgolesch #traveller #travellife #worldtraveler #traveltheworld #travelpics A photo posted by Travel Journey (@traveljour_) on Apr 8, 2016 at 6:24am PDT