sea current; tidal current
Refers to a current in the sea, often influenced by tides. Can be used in nautical or geographical contexts.
Be careful because the sea current is fast in this area.
潮瀬に乗って船が進んだ。
The ship moved along with the tidal current.
Compound of 潮 (tide) and 瀬 (shallows, rapids, current). The exact historical derivation is uncertain, but the combination naturally suggests a current associated with tidal movement.