The field used is grass with the usual exception of mud. The measurements of the field are shown in the image below. The length of the field cannot exceed 100 meters (110 yards) and the width cannot exceed 69 meters (75 yards). Each try zone cannot exceed 22 meters (25 yards) in length. Goal posts similar to those used in American football and shaped in the form of an "H" stand on the goal line at opposite ends of the field, at the beginning of each try zone. The lines usually drawn inside the field are 22 meters (25 yards) off goal, 10 meters (10 yards) off halfway and the halfway line. Also, a 5 meter (5 yard) alley is drawn along the lengths of the field measured off the touch line (out of bounds).