Australian rules football playing field

An Australian rules football playing field is a venue where Australian rules football is played.
The playing field is typically a large oval-shaped grass surface, usually a modified cricket field, hence often known as an oval. These fields may vary especially for variations of the game. However, for official Australian Football League matches, strict requirement specifications must be met for stadiums.
Australian rules football grounds, even at the highest level of the game, have no fixed dimensions. For senior football, the playing field is an oval between 135–185 metres (148–202 yd) long goal-to-goal and 110–155 metres (120–170 yd) wide wing-to-wing. Grounds can vary from long and narrow to almost circular, and are not necessarily symmetrical, depending upon how and where the field was constructed. At least 5 metres (5.5 yd) of space between the boundary line and any fence is required for safety.
Smaller fields are generally used for junior football; some are purpose-built, and some are temporarily marked out within the confines of full-sized oval; as for a senior match, there are no fixed dimensions for a junior-sized field. The Western Australian Football Commission advises that a good rule of thumb is to set the length of the field equivalent to 3+1⁄2 times the length of an average kick of the age group playing.
By definition in the laws of the game, the portion of the field inside the goal line and boundary lines is called the playing surface. The combination of the playing surface and the space between the boundary line and any perimeter fence, as well as any gaps in the perimeter fence, is called the arena.
A top-level Australian rules football ground has the following markings:
Grounds at lower or junior levels will lack many of these markings, or paint them in lower detail.
At each end of the ground there are two goal posts, spaced 6.4 m (7 yd) apart, and a further 6.4 m (7 yd) on either side of these are behind posts, 5 metres (16 ft) in height. The goal posts are conventionally painted white, and in South Australia, the behind posts are customarily painted red. All posts are typically padded with wall padding to minimise injury due to players colliding with them.
Due to possible injuries caused to players moving at high speed by marking, jumping, turning and being tackled without protective padding, the playing field standards imply use of lawn as a surface.
Almost all Australian rules football fields are of a suitable size and shape for cricket; and in the majority of cases, the fields are used for cricket in the summer and Australian rules football in the winter, a seasonal strategy which is part of the history of Australian sport. As a consequence of this, there are relatively few fields which were purpose-built for and used by Australian rules football to the exclusion of cricket and all other sports. Like the cricket oval, the field is usually referred to and named as an oval.
However, there are numerous grounds – particularly those built more recently – which were built with Australian rules football as the primary intended purpose, but upon which other sports, including cricket, have been played.
Variations of the standard field dimensions and layout exist. For junior levels, smaller fields are often used. Rectangular fields have also been used in the past in Australia and also overseas, as well as adapted fields from other sports such as association football and American football.