In 2019-20, 63% of deliberate fires were in south Wales, over a quarter in mid and west Wales, and around tenth were in north Wales.
Yn 2019-20, roedd 63% o danau bwriadol yn ne Cymru, dros chwarter yng nghanol a gorllewin Cymru, ac amgylch degfed yng ngogledd Cymru.