‘Coastal current’ produced by fresh water (dyed) released from a small source at the surface of dense salt water in rigid body anticlockwise (Northern hemisphere) rotation.

The current propagates keeping the coast on its right. Since there is no flow normal to the coast there is no Coriolis force parallel to the coast allowing the current propagate - as a form of Kelvin wave.

Note also the formation of an anticyclonic vortex at the source.