More than half the number of grassland fires in 2018-19 occurred in South Wales (52%); 32% were in Mid and West Wales and 16% were in North Wales.
Yn 2017-18, roedd dau draean o danau bwriadol yn Ne Cymru, bron chwarter yng Nghanol a Gorllewin Cymru, a degfed yng Ngogledd Cymru.