
The natural causeway which links the Shetland mainland with St. Ninians Isle is called a Tombolo. The tombolo is made up of sand and shell and will eventually erode cutting the isle off from the mainland altogether.
Image credit: notjamesbond
The natural causeway which links the Shetland mainland with St. Ninians Isle is called a Tombolo. The tombolo is made up of sand and shell and will eventually erode cutting the isle off from the mainland altogether.