The little tern breeds in colonies on gravel or shingle coasts and islands. A beach is the accumulation of sand or shingle on the shore. Coastal defences were subsequently constructed including groynes, sea walls and shingle beach. The intertidal zone of the combined estuaries includes sand, shingle and mudflats and saltmarsh. The beach is a combination of sand and shingle. The material ends up as shingle and sand. Plastic imitations of wood shingle and wood shakes also exist. Orford Ness is Europe's largest vegetated shingle spit. The simplest form of wood shingle is a rectangle about long. A shake is a basic wooden shingle made from split logs. Brookland Plantation is a plantation located on Edisto Island, South Carolina along Shingle Creek. On the east coast the Queen Anne evolved into the Shingle Style architecture. Dungeness is one of the largest expanses of shingle in Europe. Sir Banister Fletcher included the building in a list of Shingle Style architecture. A quatrefoil Martello Tower stands at the isthmus leading to the Orford Ness shingle spit.