The Noshima Murakami clan once controlled these waters by mastering the use of the area's intense natural whirlpools for naval defense.
Noshima Castle was unique in that it was built across two small islands, Noshima and Mushima, connected by a bridge-like structure in the 14th century.
The tidal currents in the Kurushima Strait can reach speeds of up to 10 knots, creating significant vertical water movement visible during boat tours.
Archaeological digs on Noshima have unearthed a large quantity of celadon and white porcelain, indicating the clan's deep involvement in international maritime trade.
Noshima Ferry Terminal serves as the gateway to the historic Noshima Island, home to the former stronghold of the Murakami Suigun, a medieval naval force. The site functions primarily as the departure point for sightseeing boats that navigate the Kurushima Strait, famous for its powerful tidal currents. The surrounding Miyakubo area is part of the Shimanami Kaido cycling route, connecting islands across the Seto Inland Sea. Visitors can view the ruins of Noshima Castle, which remains largely excavated as an archaeological site rather than a reconstructed fortification. The terminal houses information regarding the Murakami Suigun's maritime influence and their role in trade and local defense during the Nanboku-cho period. The facility provides access to boat tours that approach the whirlpools generated by the complex underwater topography of the strait.
The terminal's observation deck facing the strait provides the best vantage point of the castle ruins island.
Book boat tour tickets well in advance as seats are limited and strictly scheduled around tidal movements.
Bring windproof clothing even in warmer months, as the open boats generate significant breeze while navigating the strait.
Check the tide charts before visiting, as the whirlpool intensity changes drastically throughout the day.
Do not attempt to swim in the surrounding waters due to extremely dangerous and unpredictable tidal currents.
Tours often suspend operations during inclement weather or high-wind warnings; closed during the winter off-season.
Maintain caution near the water's edge; follow all safety instructions provided by boat crew regarding life vest usage.
