Rule 11. Teeing Ground
The "teeing ground" is the starting place for the hole to be played.
It is a rectangular area two club-lengths in depth, the front and
the sides of which are defined by the outside limits of two tee-markers.
A ball is outside the teeing ground when all of it lies outside the
teeing ground.
11-1. Teeing
In teeing, the ball may be placed on the ground, on an irregularity
of surface created by the player on the ground or on a tee, sand or
other substance in order to raise it off the ground. A player may
stand outside the teeing ground to play a ball within it.
11-2. Tee-Markers
Before a player plays his first stroke with any ball from the teeing
ground of the hole being played, the tee-markers are deemed to be
fixed. In such circumstances, if the player moves or allows to be
moved a tee-marker for the purpose of avoiding interference with his
stance, the area of his intended swing or his line of play, he
shall incur the penalty for a breach of Rule 13-2.
11-3. Ball Falling Off Tee
If a ball, when not in play, falls off a tee or is knocked off a
tee by the player in addressing it, it may be re-teed without penalty,
but if a stroke is made at the ball in these circumstances, whether
the ball is moving or not, the stroke counts but no penalty is incurred.
11-4. Playing from Outside Teeing Ground
a. Match Play - If a player, when starting a hole, plays a ball from
outside the teeing ground, the opponent may immediately require the
player to cancel the stroke so played and play a ball from within
the teeing ground, without penalty.
b. Stroke Play - If a competitor, when starting a hole, plays a
ball from outside the teeing ground, he shall
incur a penalty of two strokes and shall then play a ball from
within the teeing ground. If the competitor plays a stroke from the
next teeing ground without first correcting his mistake or, in the
case of the last hole of the round, leaves the putting green without
first declaring his intention to correct his mistake,
he shall be disqualified. Strokes played by a competitor from
outside the teeing ground do not count in his score.
11-5. Playing from Wrong Teeing Ground
The provisions of Rule 11-4 apply.