These areas are marked by white stakes, white paint, fences, walls, roads, kerbs, paths and constructions that mark out the area of the course. A ball that crosses a public road and comes to rest in another part of the course is considered out of bounds. There are two internal Out of Bounds, one to the left of Hole 7 and one to the right of Hole 13, which only affect the play of those holes.
In addition to those set out in Rule 24, stones in bunkers are considered to be Movable Obstructions (relief as per Rule 24-1).
In addition to those set out in Rule 24, the following are considered to be Immovable Obstructions (relief as per Rule 24-2b):
A – The tee marks of all the Holes.
B – Stakes marking Water Hazards and Ground under Repair.
C – Stakes marking internal Out of Bounds areas on the 7th and 13th holes, when another hole is being played.
D – The distance markers of 100 and 150 metres to the green entrance.
E – The ropes and stakes that protect the fringe.
F – All course roads, whether or not they are paved.
There is an optional drop zone on the 4th hole marked for this purpose for balls that have been hit into the Water Hazard. This drop zone is optional, and the player may also proceed according to Rule 26 (Water Hazard ball relief).
A ball that is in a closely mown area of the course can be lifted without penalty, cleaned and placed at a maximum distance of 15 cm from where it lay and no closer to the hole. The ball may be placed only once, and is in play when it has been placed (Rule 20-4). If the ball is not marked before it is lifted or is moved in any other way, such as by rolling it with a club, the one-stroke penalty is incurred.
According to decision 14-3/0.5, a player can obtain distance information using a device that measures distance only, but not any other conditions that may affect play (slopes, wind speed, etc.).