Kagoshima Prefecture is a prefecture of Japan located on Kyūshū island. The capital is the city of Kagoshima. It is located at the southwest tip of Kyūshū and includes a chain of islands stretching further to the southwest for a few hundred kilometers. The most important group is the Amami Islands. Surrounded by the Yellow Sea to the west, at least since 1879 by Okinawa Prefecture in the south, Kumamoto Prefecture to the north, and Miyazaki Prefecture to the east, it has 2,632km of coastline (including the 28 islands). It has a bay called Kagoshima Bay (Kinkowan), which is sandwiched by two peninsulas, Satsuma and Osumi. Its position made it a 'gateway' to Japan at various times in history. While Kyushu has about 13 million people there are less than 2 million in this prefecture. The prefecture boasts a chain of active and dormant volcanoes, including the great Sakurajima, which towers out of the Kagoshima bay opposite Kagoshima city. A steady trickle of smoke and ash emerges from the caldera, punctuated by louder mini-eruptions on an almost daily basis. On active days in Kagoshima city an umbrella is advisable to ward off the ash. Sakurajima is one of Japan's most active volcanoes. Major eruptions occurred in 1914, when the island mountain spilled enough material to become permanently connected to the mainland, and a lesser eruption in 1960. Volcanic materials in the soil make Sakurajima a source for record ' Daikon' radishes, roughly the size of a basketball.