A fen is a particular type of low-lying bog[?]ecosystem fed by groundwater and runoff, and containing peat below the waterline. It may feature waterways and standing water. It differs from a marsh, which contains a permanent body of water but no peat.
... Abdullah Muhammad Ibn Battuta, (1304?-1377?), Moroccan Muslim, visited Mecca several times, travelled to Central Asia, East Africa, China, Tombouctou and other ...