A golf course consists of a series of holes, each consisting of a teeing ground, fairway, rough and the other hazards, and a green with a flagstick and cup, all designed for the game of golf. A standard round of golf consists of playing 18 holes, thus most golf courses have this number of holes. Some, however, only have 9 holes and the course is played twice per round, while others have 27 or 36 and choose 2 groups of 9 holes at a time for novelty and maintenance reasons. Additionally, par-3 courses also exist, consisting of 9 or 18 holes, all of which are a Par 3. Many older golf courses, often coastal, are golf links, of a different style to others. For non-municipal courses, there is usually a golf club based at each course, and may include a pro shop.