is a Japanese national highway connecting the capital cities Kagoshima and Naha of Kagoshima Prefecture and Okinawa Prefecture, respectively. With a total length of , it is the longest national highway in Japan, though it measures only on land. The highway begins at an intersection with National Routes 3 and 10 in Kagoshima. From Kagoshima, it travels southwest along the first island chain that divides the Pacific Ocean from the East China Sea. From the north to the south, it has sections on the islands of Tanegashima, Amami Ōshima, and finally, Okinawa. On Okinawa it ends at an intersection with National Routes 330, 331, and 390 in Naha. Route description This very unusual road has continuous numbering over disconnected segments on the islands of Kyūshū, Tanegashima, Amami Ōshima, and Okinawa. The road has a total length of on land, but it has a length of when its maritime sections are included into its total length, making it the longest national highway in Japan. It originates in the prefectural capital of Kagoshima in Kagoshima Prefecture and terminates in Naha, the capital of Okinawa Prefecture. Kagoshima Prefecture At its northern terminus, National Route 58 meets National Routes 3, 10, 224, 225, and 226. The segment in the city of Kagoshima has a length of about and also carries National Route 224 towards the Port of Kagoshima. At the port, National Route 224 leaves National Route 58, continuing by ferry to the city of Tarumizu beyond the stratovolcano, Sakurajima. Heading south by ferry, the highway resumes its land route in Nishinoomote on the northern end of Tanegashima. It travels alongside the western coast of the island within Nishinoomote. Upon crossing into the town, Nakatane, the highway ventures inland, heading towards the central district of the town. Continuing south the highway crosses into the town, Minamitane on the southern end of Tanegashima. After traveling through the center of Minamitane, the highway turns northwest and heads towards the west coast of the island where the maritime section of the highway resumes at the Port of Shimama. Unlike the previous maritime section, no ferry carries the highway from Shimama to its next land segment on Amami Ōshima. In all, the highway has a length of on Tanegashima. Resuming its land route in the Amami Ōshima city of Amami, the highway travels southeast across the island from its northeastern tip. The highway crosses through the town of