What is "bontddu"

Bontddu, Dolgellau, Gwynedd, Wales is a small settlement east of Barmouth.

Local tourism information describes a popular walk in the area of Bontddu:

'follows the 100 metre contour line along the estuary to the East of Borthwnog. Directly behind us walk up into the RSPB (Garth Gell) reserve and on up toward Cwm Mynach and beyond to the wilds of the Harlech Dome. Bear left from the latter path and double back behind the village of Bontddu and join the old drovers track across to Pont Scethin which allegedly was the scene of many highway robberies in the 17th century'.