Cramond Causeway - The end of the road!
Thanks to wikipedia for this info - can't take credit for this myself!!
Cramond Island (Scottish Gaelic Eilean Chathair Amain) is one of several islands that lie in the Firth of Forth in eastern Scotland, near Edinburgh. As its name implies, it lies off Cramond. It is one third of a mile (0.5 km) long and covers 7.7 hectares (19 acres), and is currently part of the Dalmeny Estate. Strictly speaking it is not a true island at all, but a tidal island being connected to the mainland at low tide. There is a paved path, exposed at low tide, which allows easy access. This path runs at the foot of a row of concrete pylons on one side of the causeway which were constructed as a submarine defence boom and are one of the most striking sights in the area. At high tide the island is cut off from the mainland, with the path several feet below sea level. It lies about a mile from the shore, and visitors should take care to leave sufficient time to walk back to the mainland. The speed with which the water rises can catch people unawares, leaving them stranded. The island forms part of the estuary of the River Almond whose mouth is near the landward end of the crossing.