Hazard (golf)
A hazard is an area of a golf course in the sport of golf which provides a difficult obstacle, which may be of two types: penalty areas such as lakes and rivers; and bunkers. A penalty area was previously referred to as a water hazard. Special rules apply to play balls that fall in a hazard. For example, a player may not touch the ground with their club before playing a ball, not even for a practice swing. A ball in any hazard may be played as it lies without penalty. If it cannot be played from the hazard, the ball may be hit from another location, generally with a penalty of one stroke. The Rules of Golf govern exactly from where the ball may be played outside a hazard. Bunkers are shallow pits filled with sand and generally incorporating a raised lip or barrier, from which the ball is more difficult to play than from grass.
Bunker
A bunker is a depression, commonly near the green or fairway, that is usually filled with sand. Playing the ball from a bunker is considered more difficult than from closely mown grass, and to do so proficiently requires a high degree of skill. A specialized club called a "sand wedge" is designed for extracting the ball from a bunker. Specific rules of golf govern play from a bunker. For example, a player may not ground their club in a bunker; that is, the club cannot touch the ground before the swing.According to the etiquette of the game, the player is expected to smooth the area of the sand disturbed, normally using a rake, in order that conditions are similar for all subsequent players.
According to Gordon Moir, the links manager at St. Andrews, sand traps were originally formed out of natural depressions in the landscape because "the sheep would burrow down behind them to take shelter from the wind. Over time, these areas hollowed out to form the bunkers, or as you Yanks say, sand traps."
Old Tom Morris is said to be responsible for maintaining sand traps and hazards to form playable conditions, using rakes to create surfaces that were more predictable than the natural hazards they once were. Additionally, he is said to have been a pioneer in the modern idea of placing hazards so that the golf ball could be routed around them, forming the beginning of strategic golf course design.