Sports fields and playing surfaces are the locations where the games are played. For the most part these surfaces are physical grass fields or courts. However, with water sports, the playing surface may be a swimming pool of water or the ocean with sailing. Since sports can be played inside, outside, or in virtual spaces as is the case with ESports, playing surfaces are only limited to the imagination. Each field and surface is unique to the rules of the sport, with lines, markings, and components mapped out ahead of time by officials and referees. Each surface has a set of dimensions and components.