<P> The surface is divided lengthwise by five lines marked on the ice surface: icing line, blue line, centre red line, blue line, icing line . The middle three lines mark the three zones of the rink and are the defending zone (icing line to blue line), the neutral zone (blue line to blue line), and the attacking zone (blue line to icing line). </P> <P> The two icing lines are 4.0 metres (13.1 ft) from the end boards, and the blue lines are 22.86 metres (75.0 ft) from the end boards . </P> <P> Most North American rinks follow the National Hockey League (NHL) specifications of 200 feet (61 m) × 85 feet (26 m) with a corner radius of 28 feet (8.5 m). The distance from the end boards to the nearest goal line is 11 feet (3.4 m). The NHL attacking zones are expanded, with blue lines 64 feet (20 m) from the goal line and 50 feet (15 m) apart . Canadian rinks may vary from NHL ones, especially in the goal crease shape (semi-circular), and in the rink dimensions which can accept widths from 85 to 100 feet . </P> <P> The rink specifications originate from the ice surface of the Victoria Skating Rink in Montreal, constructed in 1862, where the first indoor game was played in 1875 . Its ice surface measured 204 feet (62 m) × 80 feet (24 m). The curved corners are considered to originate from the design of the Montreal Arena, also in Montreal, constructed in 1898 . </P>

What is the length of an nhl hockey rink
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