sentences:  The river is a slowly meandering stream passing through marshy, wet woodland with alder trees, water meadows and flood plains.Its river valley is deep and secluded through the Gwaun Valley, and passes through Pontfaen and Llanychaer to the sea at Lower Fishguard Bay.It has a total length of and is navigable by canoe for the lower third of its length, beginning west of Pontfaen.