The River Fal flows through Cornwall, United Kingdom, rising on the Goss Moor (between St. Columb and St Austell) and reaching the English Channel at Falmouth. The River Fal separates the Roseland Peninsula from the rest of Cornwall. The Fal estuary is a classic ria, or drowned river valley, caused by rising sea levels. The main tributary of the Fal is the River Truro. The estuary of the River Fal is called Carrick Roads.