Why does the Mediterranean have no tide?
The Mediterranean does have some tidal range, but it is slight compared with other places on earth. Because the Mediterranean is nearly landlocked, with the only major opening to open seas being the Strait of Gibraltar, the Mediterranean at large is not affected by the movement of large volumes of Pacific waters. The tidal range in mid-ocean is about 2 feet in some areas, which may seem strange at first. But in mid-ocean, there is so much water everywhere, that substantial movement of water at a given place is matched by similar movements all around, amounting to a kind of huge cycling shift. The effects of tide are greatest usually near coastlines, where the water moves up against the unmoving land.