Around 90% of the fires this year were believed to be started deliberately, which in dry weather can spread out of control and put communities, natural landscapes and wildlife at risk.
Credir bod tua 90% o'r tanau eleni wedi cael eu dechrau'n fwriadol, ac mewn tywydd sych mae'r rhain yn gallu lledaenu allan o reolaeth a rhoi cymunedau, tirweddau naturiol a bywyd gwyllt mewn perygl.