You can see why the boats can enter and exit Rock Harbor in Orleans on Cape Cod only before or after  high tide. Otherwise, they could get stuck in Cape Cod Bay or in the harbor for many hours waiting for the tide to change.

You can see the “buoy trees” which mark the channel into the harbor sitting on top of the sand. It is dead low tide. No boats will be going in for quite a while.

And at low tide, you can walk out it seems for mile. Have you ever been to Cape Cod Bay at low tide?