Tides in marginal seas are tides affected by their location in semi-enclosed areas along the margins of continents and differ from tides in the open oceans. Tides are water level variations caused by the gravitational interaction between the moon, the sun and the earth. The resulting tidal force is a secondary effect of gravity: it is the difference between the actual gravitational force and the centrifugal force. While the centrifugal force is constant across the earth, the gravitational force is dependent on the distance between the two bodies and is therefore not constant across the earth. The tidal force is thus the difference between these two forces on each location on the earth.https://beltoforion.de/en/tides/simulation.php Tidal forces explained
