GR trails in Brittany: GR34, Belle-Île (GR340), GR38 and GR39

Brittany is the home of the GR34, the customs officers' path, which follows the coastline as close to the sea as possible, from the bay of Mont-Saint-Michel to the Loire estuary. Off Quiberon, the GR340 goes around Belle-Île-en-Mer.

Inland, the GR38 links Douarnenez to Redon via the Montagnes Noires and the Landes de Lanvaux, and the GR39 runs down from Mont-Saint-Michel to the Brière marshes via Rennes and the Vilaine valley.

There are no high mountains here, but a rollercoaster coastal terrain, villages at every stage and tides to take into account.