Saw-tooth bar features occur on the downdrift side of the ebb-tidal delta of the Ameland Inlet as well as in front of the island of Ameland. The height difference between bar maximum and trough minimum can amount to 150 cm on the ebb-tidal delta and to about 25 cm in front of Ameland. Their lengths range between 500 mand 2 km. Their width generally ranges between 100 and 500 m. Saw-tooth bars and troughs migrate in a downdrift (eastern) direction with a mean rate of 100-200 m/yr. The saw-tooth bars on the ebb-tidal delta gradually migrate into the ones lying in front of Ameland in 1989. A transition zone exists between these two types of bars in 1993 and 1996 where the downdrift migration of bars and troughs is disturbed. This transition zone migrates dowdrift and coincides with the outflow area of an inner lake. This inner lake originated in 1993 by the extension of a sandy spit along the north-west coast of Ameland. In 1989, this spit was absent. Bar and trough dimensions differ distinctly for both locations in 1993 and 1996.