
die Gezeiten
tides
The regular rising and falling of sea level caused by the gravitational forces of the moon and the sun. A distinction is made between 'Ebbe' (ebb tide, receding water) and 'Flut' (flood tide, incoming water). The word is used almost exclusively in the plural.
An der Nordsee muss man bei einer Wattwanderung immer die Gezeiten beachten.
On the North Sea, you always have to pay attention to the tides when hiking across the mudflats.

