is a town located in Arida District, in central Wakayama Prefecture, Japan. , the town had an estimated population of 25,940 in 10680 households and a population density of 74 persons per km<sup>2</sup>. The total area of the town is .
Aridagawa is located in the north-center of Wakayama prefecture, with the Aridagawa River running through the center of the town. Although there are some flatlands along the Aridagawa River, most of the town tends to be mountainous.
Wakayama Prefecture
Nara Prefecture
Aridagawa has a Humid subtropical climate (Köppen Cfa) characterized by warm summers and cool winters with light to no snowfall. The average annual temperature in Aridagawa is . The average annual rainfall is with July as the wettest month. The temperatures are highest on average in August, at around , and lowest in January, at around . The area is subject to typhoons in summer.
Per Japanese census data, the population of Aridagawa has been declining steadily over the past 70 years.
Aridagawa was established on January 1, 2006, by the merger of the towns of Kanaya, Kibi and Shimizu, all from Arida District.
Aridagawa has a mayor-council form of government with a directly elected mayor and a unicameral city council of 16 members. Hidaka collectively with the other municipalities of Arida District, contributes two members to the Wakayama Prefectural Assembly. In terms of national politics, the town is part of Wakayama 3rd district of the lower house of the Diet of Japan.
The economy of Aridagawa is dominated by agriculture (horticulture), especially with citrus fruits. The town is also a major producer of sanshà  pepper.
Aridagawa has nine public elementary schools and four public middle schools operated by the town government, and one public high school operated by the Wakayama Prefectural Board of Education..
JR West â Kisei Main Line