 The hockey pitch is rectangular in shape . The longer perimeter edges are called the side line , the opposing shorter edges are referred toe back line and the portion of this between the goal posts is known as the goal line . The side line must measure 91 @.@ 40 m ( 100 yd ) and the back line should measure 55 @.@ 00 m ( 60 yd ) . There must be a minimum run @-@ off of 2 m at the sidelines and 3 m at the backlines which may be a different surface for the final metre . All line markings must be white and 75 millimetres wide . In each corner of the pitch , a corner flag of no more than 300 mm square is attached to a post of height 1 @.@ 20 – 1 @.@ 50 m . 
