Directly beneath a large granite cliff lies a stone about 2 m above the sea, and 3 m in width, that looks like a mortar (usu). The Kuroshio Current, swirling in it, looks like a millstone being ground, giving it the name “usubae.” This is also the first place in Japan where the Kuroshio Current reaches the coast, and is believed to be the only place along the coast where its flow can be seen. Known nationwide as a mecca of fishing, it is also used as a filming site for movies.
Matsuo, Tosashimizu City, Kochi
By car: Get off the Kochi Expressway at Shimantocho-chuo IC, then take National Routes 56 and 321, then Prefectural Route 27 west. It takes about 1 hr 55 mins. By public transport: After getting off at Nakamura Station on the Tosa Kuroshio Railway, take the Kochi Seinan Kotsu bus going to Ashizurimisaki for about 90 minutes and get off at the Usubae bus stop.