Built during the fifteenth century, this bisse flows partly in the open air and partly through a water duct.

Total length : Approximately 11 km.

Altitude : Between 1000 and 1400 metres.

Route time : Approximately 3 hours to Aven.

Location : Mayens de My and Conthey, to the right of the Rhône.

Difficulty : This bisse can follow on from the Petit Bisse which starts at the Grande Zour. There is no particular difficulty, though there are one or two overpasses on the Petit Bisse. These can be avoided by joining the Petit Bisse 1 km lower and using a forest road which ascends to the right of the main road.

Ordinance Survey map 1 : 50'000  no. 273T Montana.

Best period : Mid-May to mid-October.

This bisse contains water from early June to late October.

Departure

To begin, take the bus from Sion to Grande Zour. The stop is located at the bridge over the Morge. Follow the road back towards Sion for about a hundred metres and join the Petit Bisse a few metres above the road on the right.

Itinerary

Follow the path of the Petit Bisse until you reach the Bisse de la Tsandra at Mayens de My. At the end of the Petit Bisse, descend towards La Dare - Mayens de My to reach the start of the Bisse de la Tsandra and follow this until you reach Aven (Conthey). From this village take  the bus back to Sion.

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