1A turbulent stretch of open water caused by the wind blowing against a current, by a strong current or tide over an underwater ridge, or by a meeting of currents.
- You need very calm surface conditions and a northward current in Jack Sound, but not so strong as to cause turbulent overfalls.
- This current is often too strong to swim against, but it's never strong enough to form overfalls on this part of the reef.
- Divers should be aware that the whole area is subject to complex and strong tidal streams and heavy overfalls.
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