A reach is a segment of a stream, river, or arm of the sea, usually suggesting a straight, level, uninterrupted stretch.They are traditionally defined by the capabilities of sailing boats, as a stretch of a watercourse which, because it is straightish, can be sailed in one "reach" (that is, without tacking).
Reaches are often named by those using the river, and a reach may be named for landmarks, natural features, and historical reasons (see, for instance, Gallions Reach, named after the family that once owned its banks).
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