contrast an association football field needs only about of grass, and an Olympic stadium would contain of grass within its 400m running track, making it difficult to play international cricket in stadiums not built for the purpose. Nevertheless, Stadium Australia which hosted the Sydney Olympics in 2000 had its running track turfed over with 30,000 seats removed to make it possible to play cricket there, at a cost of A$80 million. This is one of the reasons cricket games generally cannot be hosted outside the traditional cricket-playing countries, and a few non-Test nations like Canada, the UAE and Kenya that have built Test standard stadiums. Pitch Most of the action takes place in the centre of this ground, on a rectangular clay strip usually with short grass called the pitch. The pitch measures (1 chain) long. At each end of the pitch three upright wooden stakes, called the stumps, are hammered into the ground. Two wooden crosspieces, known as the bails, sit in grooves atop the stumps, linking each to its neighbour. Each set of three stumps and two bails is collectively known as a wicket. One end of the pitch is designated the batting end where the batsman stands and the other is designated the bowling end where the bowler runs in to bowl. The area of the field on the side of the line joining the wickets where the batsman holds his bat (the right-hand side for a right-handed batsman, the left for a left-hander) is known as the off side, the other as the leg side or on side. Lines drawn or painted on the pitch are known as creases. Creases are used to adjudicate the dismissals of batsmen, by indicating where the batsmen's grounds are, and to determine whether a delivery is fair. Parts of the field For limited overs cricket matches, there are two additional field markings to define areas relating to fielding restrictions. The "circle" or "fielding circle" is an oval described by drawing a semicircle of 30 yards (27.4 m) radius from the centre of each wicket with respect to the breadth of the pitch and joining them with lines parallel, 30 yards (27.4 m) to the length of the pitch. This divides the field into an infield and outfield and can be marked by a painted line or evenly spaced discs. The close-infield is defined by a circle of radius 15 yards