Rip currents
Channels in the sand where water flows back out to sea. Do not swim against them: drift, then return to shore from the side.
Other terms
Bathymetry · Beach break · Breaking height · Confidence · Cross-shore wind · Crossed swells · Ensemble forecast · Forecast model · Gusts · Iribarren (breaker type) · Offshore wind · Onshore wind · Peak period · Period · Persistence · Point break · Range · Reef · Seabed relief (EMODnet) · Set · Shorebreak · Submarine canyon · Swell · Swell direction · Tidal range · Tide · Tide coefficient · Wind sea