It covers an area of around , including two large peat bogs known as Thorne and Hatfield Moors , and is part of the once-vast Humberhead Levels , a wetland which originally covered some .
It covers an area of around 110 sqmi , including two large peat bogs known as Thorne and Hatfield Moors . Hatfield chase is part of the once vast Humberhead Levels , a wetland which originally covered some 770 sqmi .