Initially, the port of Le Guildo was a dual port (seaport and river port). The building of roads, thanks to the moderate height of the banks, facilitated the development of trade. Exchange increased naturally with the closest ports, especially Saint-Malo. Wheat, wood and canvas were exported, while building materials were imported.
Renowned shipbuilding workshops were also created.
During the French Revolution, commercial navigation began, with larger boats (vessels of 200 to 300 frequently dropped anchor in the Port of Le Guildo) and with distant ports: Rouen, Nantes, Bordeaux and ports of southern England.
The river port
Traffic on the river Arguenon between Le Guildo and Plancoët was important, given the tides and the seaport. Barges brought building materials, coal and organic fertilizer in Plancoët. When they returned to Le Guildo, barges were loaded with leather (which used to be transformed by cobblers), cereals, fruits and vegetables, as well as wood and cloth. WW1 caused the decline of commercial traffic.
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