The 'Ika-maru' boat is uniquely shaped like a squid to reflect the local fishing industry's focus.
The Nanatsugama Caves, the main destination of the boat tours, were carved by the rough waves of the Genkai Sea.
The underwater observation decks on the boats allow for viewing of fish without requiring snorkeling or diving equipment.
The Yobuko area is one of the few places in Japan where semi-submersible sightseeing vessels are operated year-round.
The sea caves at Nanatsugama are basaltic, created through volcanic activity followed by erosion.
Marinepal Yobuko is a specialized maritime sightseeing facility located in the Yobuko district of Karatsu, Saga Prefecture. The site operates two distinct types of semi-submersible vessels, the 'Zeela' and the 'Ika-maru', which provide underwater viewing opportunities for passengers. These boats allow visitors to observe schools of fish and marine life through submerged glass viewing windows. The Ika-maru features a whale-inspired exterior design and cruises toward the Nanatsugama Caves, a series of seven sea caves designated as a National Natural Monument. During the transit, visitors can participate in fish-feeding activities from the deck. The facility is situated at the Yobuko port, serving as a hub for exploring the coastal geology of the Genkai Sea. It remains a primary destination for those visiting Yobuko, a town historically famous for its squid production.
The top deck of the Ika-maru boat offers the best panoramic shots of the Genkai Sea and the cliffside coastline.
Check the official website for real-time operation status, as boat tours are frequently cancelled during high winds or rough sea conditions.
Wear comfortable, non-slip footwear as decks can become wet and slick during transit.
Bring a light jacket even in summer, as sea breezes are cooler than on the mainland.
Do not assume tours are running if the weather seems calm; always verify status on the website as currents may be strong even when the air is still.
Operations are subject to immediate suspension based on sea and weather conditions, especially during storm seasons.
