Early cog

Although early cogs are depicted from the 9th century onwards, no such shipwreck has been found yet. The early cog, as envisioned by experts, is a Frisian invention, adapted to the specific circumstances of the Rhine-Scheldt delta. The tide in this zone requires a boat with a flat bottom that can operate in shallow water and that can rest on the bottom at low tide (to be loaded and unloaded). As t…