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Red stakes indicate a lateral water hazard.
It is the shortened term for out of bounds.
Yellow is a water hazard. Red is a lateral hazard. White is out of bounds. The rules indicate how each of these should be dealt with.
Water hazard - yellow stakes, lateral hazard - red stakes and bunkers.
Trap or hazard
a 2 on a par 5
One over par on a given golf hole.
The risk for a hazard before controls are put in place
The red boundary post indicate a lateral water hazard in golf.