Blue Cave (Otaru, Hokkaido)

The Blue Cave, where sunlight filters through and illuminates the sea floor, is a natural masterpiece created by the absorption of all colors except blue from the spectrum of light. This phenomenon, a result of the perfect blend of water clarity, geographical features, and the angle of light, can be found in various places around the world, including the renowned Capri Island in Italy. However, the cave located within the Niseko Shakotan Otaru Quasi-National Park is a must-visit when touring Otaru.

Accessible along the coastline, the cave's broad entrance allows visitors to enter it directly by boat, thanks to several cruise tours operated by different companies. The embarkation points vary, including Otaru Port, Shioya Port, and Iwatozu Port. There's a choice of boats, from glass-bottomed vessels to powerful cruisers and rafting boats, depending on your preference. For marine sports enthusiasts, sea kayaking or SUP (Stand-Up Paddleboarding) could be great options. The nearby peculiar rocks and cliffs are also worth seeing.