Construction began in 1802 and ended in 1825.
The Blavet Canal is 60 kilometres long (37.28 miles) with a total of 60 kilometres of navigable waterway.
There is a total of 22 locks, with an average of 1 lock every 2.73 kilometres (1.69 miles).
The highest point on the Blavet Canal is 55 metres (180′ 5″ ft) above sea level
and the lowest point is at 1 metres (3′ 3″ ft) above sea level.
From Pontivy to Hennebont
The water draft is 1.4 metres (3′ 3″ ft)
and the air draft is 2.4 metres (6′ 7″ ft).
General lock size
There are "Breton" lock types.
Lock length 26.3 metres (85′ 4″ ft)
Lock width 4.7 metres (13′ 1″ ft)
The Blavet Canal flows north to south connecting the Canal of Nantes to Brest to the Bay of Biscay via the Lorient river.
It was under the orders of Napolean Bonaparte in 1802 that construction began and the canal became part of the strategic waterway network of Brittany.