The Higashikyushu Expressway is one of the expressways of Japan from Kitakyūshū to east of Kagoshima linking with the Kyushu Expressway. It runs north to south, through the prefectures of Fukuoka, Oita, Miyazaki and the Kagoshima prefectures. The freeway runs entirely on the island of Kyūshū. The total length is 500 km.

Aira is a city located in Kagoshima Prefecture, Japan. It is located west of Kirishima and north of Kagoshima. As of 29 February 2024, the city had an estimated population of 77,948 in 38338 households, and a population density of 340 persons per km². The total area of the city is 231.25 km2 (89.29 sq mi).