On the west Hatfield Chase is bordered by the M18 motorway. The River Ouse is its northern border. The River Idle is to the south, and the Isle of Axholme borders the area to the east. It covers an area of around , 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 .