Some may not know this, but as you zoom in with Google Maps, the imagery that’s used may change, as a result on occasion some strange things may happen. The following is a great example.
On Lybia’s shoreline (with the Mediterranean sea), you can tell there’s either some seasonal flooding, or some big tide difference. Open that link (as is), and zoom in 1 level. You’ll be able to see the difference. Still curious if it’s flooding or a tide thing.
Edit [9/18/06]: I should note at some point this will likely prove false, as Google occasionally updates the images.