English: peat hag
Welsh: torlan fawn 
Subject: Amgylchedd
Welsh definition: A peat hag is a type of erosion that can occur at the sides of gullies or seemingly in isolation. They often arise as a result of water flow eroding downwards into the peat or where a fire or overgrazing has exposed the peat surface to dry out and blow or wash away.
Welsh context: Wrth fynd ati i asesu’r ardaloedd sydd wedi’u targedu, dylid asesu i ba raddau y ceir nodweddion sy’n gysylltiedig â sychu, dirywio ac erydu. Dylid asesu draeniau sydd wedi’u rheoli, gripiau a thorlannau mawn/mawn moel.
Plural: torlannau mawn