Usubae Observatory

Usubae Observatory sits atop imposing red-brown granite cliffs at the western tip of the Ashizuri Peninsula in Tosashimizu City, Kochi Prefecture. This dramatic viewpoint marks the location where the warm Kuroshio Current (Japan Current) first hits Shikoku on its way north along Japan's Pacific coast, making it the only place in Japan where visitors can witness the main stream of this powerful ocean current coming ashore. The cliffs were formed from granite that cooled deep beneath the Earth's surface millions of years ago, shaped over time by weathering and erosion into their present striking formation.

The site holds special significance in local fishing history, as these waters off the Usubae cliffs were where fishermen first successfully caught skipjack tuna (katsuo), from which the essential Japanese ingredient katsuobushi (smoked and dried fish fillets) is made. The Ryugu Shrine perches high on one of the cliffs, where fishermen's wives traditionally held feasts to pray for their husbands' safety at sea and a plentiful catch. The intense power of the Kuroshio Current creates dramatic whirlpools around the rocky reefs directly beneath the observation point, which can be viewed from the clifftop vantage.

Visitors to Usubae Observatory experience panoramic views of the Pacific Ocean stretching to the horizon, with the chance to observe the swirling patterns of the current as it meets the coastline. The sheer granite faces drop dramatically into the churning waters below, offering photographers and nature enthusiasts striking coastal scenery. The nearby Usubae Sakura Park, located on a slope at approximately 120 meters elevation, provides additional viewing opportunities and is particularly popular during cherry blossom season when visitors can enjoy both sea views and seasonal blooms.

The observatory is part of the Tosashimizu Geopark, which received National Geopark designation for its geological and natural heritage. Access to Usubae is via local roads from central Tosashimizu City, with the site located several kilometers from the more famous Cape Ashizuri. The observation area is open year-round with no admission fee, though visitors should exercise caution near the cliff edges and in windy conditions. The remote location offers a quieter alternative to busier tourist spots while providing equally dramatic ocean vistas and unique opportunities to witness one of Japan's most significant ocean currents in action.