The GR30 goes around many lakes of Auvergne of glacial (Lac de Guéry) or volcanic (Lac Pavin, Lac de la Cassière...) origin and crosses three volcanic regions of Auvergne: the Monts-Dore, the Puys chain and the Cezallier.

https://www.gr-infos.com/gr30.htm

The K&P trail runs along the old Kingston and Pembroke Railway bed.  It is a series of unconnected sections between Kingston and Renfrew, Ontario. The total distance of the segments is approximately 176 km. The trail is a mixed-use trail with a variety of activities including hiking, ATV, and snowmobiling. The sections include:

Follow the Butcombe trail through the Mendips hills.

https://www.walkingenglishman.com/ldp/butcombetrail.html