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A thickened bar across a watercourse.
Also known as: Damu mark, Impoundment mark
Denotes a dam on a Japanese topographic map, drawn across the impounded water.
Is drawn heavier than the banks it meets so that the structure reads as built rather than as a natural narrowing of the water.
Contexts: Maps
A heavy bar drawn across the line of a watercourse, thicker than the banks it joins.