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Heres a quote from the USGA

The player must lift the ball and drop it within one club-length of and not nearer the hole than the nearest point of relief. The nearest point of relief must not be in a hazard or on a putting green. When dropping the ball within one club-length of the nearest point of relief, the ball must first strike a part of the course at a spot that avoids interference by the wrong putting green and is not in a hazard and not on a putting green. The ball may be cleaned when lifted under this Rule. and

A dropped ball must be re-dropped, without penalty, if it:

(i) rolls into and comes to rest in a hazard;
(ii) rolls out of and comes to rest outside a hazard;
(iii) rolls onto and comes to rest on a putting green;
(iv) rolls and comes to rest out of bounds;
(v) rolls to and comes to rest in a position where there is interference by the condition from which relief was taken under Rule 24-2b (immovable obstruction), Rule 25-1 (abnormal ground conditions), Rule 25-3 (wrong putting green) or a Local Rule (Rule 33-8a), or rolls back into the pitch-mark from which it was lifted under Rule 25-2 (embedded ball);
(vi) rolls and comes to rest more than two club-lengths from where it first struck a part of the course; or
(vii) rolls and comes to rest nearer the hole than:

(a) its original position or estimated position (see Rule 20-2b) unless otherwise permitted by the Rules; or
(b) the nearest point of relief or maximum available relief (Rule 24-2, 25-1 or 25-3); or
(c) the point where the original ball last crossed the margin of the water hazard or lateral water hazard (Rule 26-1). and

A "bunker" is a hazard consisting of a prepared area of ground, often a hollow, from which turf or soil has been removed and replaced with sand or the like. so interpret as you may