Although the Loire is the longest river in France (1,010 kilometers) only a short portion is navigable; the bed of the river is relatively wide but most of the year the flow is small, thus the channel is shallow and wanders across the sandy bed. Shallow-draft boats are used locally.
Loire Maritime - Navigation from the Bay of Biscay into the Loire is tidal from the mouth of the river at St Nazaire to Nantes.
Loire (navigable) - This portion of the Loire is an 85 km link between Nantes (Loire PK646) and the rivers of Maine-Anjou. The location of the channel and the depth varies significantly.
There are only two other short sections where the river can be navigated:
Loire River, France
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Loire river and the waterways of Maine-Anjou are described in detail in EuroCanals Guide: Cruising the Canals & Rivers of France.