Shikanoshima Island

Shikanoshima Island sits in the northern end of Hakata Bay, Fukuoka, connected to the Kyushu mainland by a narrow sandbar causeway called Uminonakamichi. Despite technically being an island, it is accessible by both road and ferry. Its perimeter measures approximately 11 km, and the island has served as a point of contact between Japan and the Asian continent for over 2,000 years, sitting along ancient maritime trade routes linking Japan with the Korean Peninsula and China.

The island's most significant historical artifact is the King of Na Gold Seal (Kinin), unearthed by a farmer in 1784 and now designated Japan's first National Treasure. The seal dates to 57 AD, when it was gifted by Emperor Guangwu of the Han Dynasty to a Japanese envoy, and bears the inscription Kan no Wa no Na no Kokuo ("King of the Na State, Vassal of the Han Dynasty"). The original is housed at the Fukuoka City Museum, while Kinin Park marks the discovery site on the island. The island is also home to Shikaumi Shrine, one of Kyushu's oldest maritime shrines dedicated to the gods of the sea, and Mokozuka Mound, a burial site connected to Japan's 13th-century Mongol invasions.

Visitors can cycle the Kinin Kaido, the scenic coastal road that circles the island, with bicycle rentals available near the ferry terminal at Shikanoshima Cycle. The Shiomi Park Observatory at the island's highest point offers views across Hakata Bay, and on clear days extends to Iki Island and the UNESCO World Heritage site of Okinoshima.

The Shikanoshima Visitor Center uses digital exhibits and dioramas to explain the gold seal discovery and the island's geological formation. The Kyukamura Shikanoshima resort facility houses the island's only natural hot spring, Kin-in no Yu, as well as a restaurant known for the local specialty Sazae-don — a turban shell rice bowl. Katsuma Beach on the island's northwest is the main swimming and marine sports area.

Admission to the island is free. By ferry, the Fukuoka Municipal Ferry departs from Hakata Wharf (Bayside Place Hakata) and reaches Shikanoshima in approximately 30 minutes, with around 15 round trips daily. By train, take the JR Fukuoka Prefectural Railway (Kagoshima Line) to Saitozaki Station, from where buses and rental bicycles are available for the short remaining journey across the sandbar. By car, the island is accessible via the single Michikiri Road that runs through the sea along Uminonakamichi.