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Daikon Island

Daikon Island (大根島, Daikon-jima) is a volcanic island in the middle of Sakumia, a brackish volcanic lake between Tottori and Shimane prefectures in Japan. Daikon Island is administered as part of Matsue, Shimane Prefecture. Daikon-jima takes its name from the daikon, the large, white East Asian radish. The island was, however, known throughout Japanese history as "Tako-shima", meaning "Octopus Island."[1][2][3]
Location:  Nakaumi
Length:  3.3 km (2.05 mi)  
Width:  2.2 km (1.37 mi)  
Coastline:  12 km (7.5 mi)