Mawddach Crescent was a row of properties overlooking the Mawddach estuary that was built early in the 20th century at Arthog near Barmouth. It was intended to be the start of a purpose built holiday resort but the surrounding land proved unsuitable for further construction. In 1941, during the Second World War, the Crescent was commandeered by the Royal Marines. It was renamed Camp Iceland and used as a training facility. In the 1990s the run down Crescent underwent major renovation. The properties are now used again for their original purpose as holiday homes.