The Yoshino is famous for Japan's best white-water rafting, with trips going along the Oboke Koboke sections of the river. Shikoku has four important capes: Gamōda in Anan, Tokushima on the easternmost point on the island, Sada in Ikata, and Ehime on the westernmost point. Muroto in Muroto, Kōchi and Ashizuri, the southern extreme of Shikoku, in Tosashimizu, Kōchi, jut into the Pacific Ocean. The island's northernmost point is in Takamatsu, Kagawa. Unlike the other three major islands of Japan, Shikoku has no volcanoes. Shikoku has a total population of 3,845,534 in 2015. The largest city is Matsuyama (population: 509,835) and is the capital of Ehime Prefecture. Shikoku is the main island with the third largest population density, at 204.55 km2 (78.98 sq mi). Shikoku has historically been rather isolated and therefore it has kept the original characteristics of Japan for a longer period, especially in regards to vegetation and some architectural techniques. There are many Buddhist temples. One of the most fascinating descriptions of the "lost" Shikoku is by the Japanologist Alex Kerr. Since 1970, the American writer lived in a remote mountain village near Oboke (大歩危) for many years. Ashizuri-Uwakai National Park is located in the south-western part of Shikoku. Shikoku is also famous for its 88-temple pilgrimage of temples. The pilgrimage was established by the ancient Buddhist priest Kūkai, a native of Shikoku. According to legend, the monk would still appear to pilgrims today. Most modern-day pilgrims travel by bus, rarely choosing the old-fashioned method of going by foot. They are seen wearing white jackets emblazoned with the characters reading "dōgyō ninin" meaning "two traveling together". Tokushima Prefecture also has its annual Awa Odori running in August at the time of the Obon festival, which attracts thousands of tourists each year from all over Japan and from abroad. Kōchi Prefecture is home to the first annual Yosakoi festival. The largest festival in Kōchi, it takes place in August every year and attracts dancers and tourists from all over Japan. One of the major foods of Shikoku is udon.