Camboa do Morgado is an ancient stone fishing ground near the coast. It is a fishing structure consisting of stone walls surrounding small ‘pools’ that are submerged at high tide, allowing fish to be caught as the tide recedes. Camboa do Morgado, now in disuse, had a wall over 50 metres long. Historical documents indicate that this type of trap was used since the Middle Ages – there are references to camboas in Viana do Castelo dating back to 1258 – until a 1940 law prohibited non-selective fishing, making the use (and even forcing the demolition) of many of these traditional structures unfeasible.