THE FENCES 1 & 17 - Thron Fence: 4ft 7in high, 2ft 9in wide - claims many victims first time around who are simply travelling too fast. 2 & 18 - Almost the same height as the first but much wider at 3ft 6in. 3 & 19 - Westhead: A 6ft ditch on the approach to a 5ft high and 3in wide fence. 4 & 20 Plain fence, 4ft 10in high and 3ft wide. 5 & 21 - Spruce dressed, 5ft high and 3ft 6in wide. 6 & 22 - Becher's Brook - Although the fence looks inocuous from the take-off side, the steep drop on landing side together with a left-hand turn on landing combine to make this the most thrilling and famous fence in the world of steeple racing. 7 & 23 - Foinavon - Basically an 'ordianry' fence 4ft 6in high and 3ft wide. 8 & 24 - Canal Turn: Made of hawthorn stakes covered in Norway spruce. 9 & 25 - Valentine's Brook: The third of four famous fences to be jumped in succession, it is 5ft highh and 3ft 3in wide with a brook on the landing side about 5ft 6in wide. 10 & 26 - Thorn fence, 5ft high and 3ft wide. 11 & 27 - Booth - The main problem with fence, which is 5ft high and 3ft wide, is in the 6ft wide ditch on the take-off. 12 & 28 - Same size as the two previous fences, but with a ditch on the landing side which can catch runners out. 13 & 29 - Second-last on the final circuit, 4ft 7in high and 3ft wide. 14 & 30 - Almost the same height as the previous fence and rare for any horse to fall at the final fence in the 'National'. 15 - The Chair - At 5ft 2in (1.57m), both the tallest and the broadest fence on the course. With a 6ft (1.82m) wide ditch on the take-off side, The Chair requires a perfectly-timed leap from horse to rider. 16 - The Water Jump - The 2ft 9in Water Jump brings the first circuit to an end and the sight of the runners leaping at speed presents a terrific spectacle. | 
