A deposition landform in which an island is attached to the mainland by a narrow piece of land such as a spit or bar. Once attached, the island is then known as a tied island.
Tombolo near Karystos, Euboea, Greece, Source: Wikipedia Commons
Tombolo in the Bay of Biscay, Source: iStockphoto/Thinkstock
Goff Island, Laguna Beach, CA, Source: www.flickriver.com