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Wikipedia definition
1. NavigabilityA body of water, such as a river, canal or lake, is navigable if it is deep, wide and slow enough for a vessel to pass. Preferably there are few obstructions such as rocks or trees to avoid. Bridges must have sufficient clearance. High water speed may make a channel unnavigable. Waters may be unnavigable because of ice, particularly in winter. Navigability depends on context: A small river may be navigable by smaller craft, such as a motor boat or a kayak, but unnavigable by a cruise ship.
Read “Navigability” on English Wikipedia
Read “航行可能” on Japanese Wikipedia
Read “Navigability” on DBpedia

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