The island is known as the spot where the Gold Seal of the King of Na, a national treasure, was discovered.
The island is about 11 kilometres around and connected to the Umi no Nakamichi (road) on the mainland by a causeway.
On the hill that commands a view of Hakata Bay, two farmers found the golden seal in 1784.
According to Chinese chronicles, about 2,000 years ago, the Emperor Guangwu of Han, a dynasty of ancient China, granted an envoy from Japan a golden block seal, which was to be presented to the envoy's king.
Notable people from the island include Nogizaka46 member Yūki Yoda[2] and singer Sayuri.