Definition
Formed where a river's outflow meets the sea and loses velocity, or by longshore drift across an estuary mouth. It usually carries the least depth on the approach and its position and depth can shift after gales or floods, so charted figures may be outdated. In an ebb tide against an onshore swell a bar becomes dangerously steep and breaking, and the safe practice is to cross near high water slack with the swell behind.
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