Osakasayama city became a sister city with Ontario city in Oregon, United States of America, in 1974. Within Japan, Osakasayama city became a friendship city with Hidakagunmiyama-mura (now Hidakagawacho) of Wakayama Prefecture in 2000.
<Sister City Ontario>
Ontario is on the East-side edge of Oregon State of the United States. Bordering the State of Idaho, it has an area of 80km2, with a population of about 11,000. The climate is similar to that of Hokkaido in Japan. After becoming sister cities in 1974, there has been continued mutual exchange including group visits made in good-will and international students, which has fostered strong feelings of friendship among many of their respective citizens.
<Friendship City Hidakagawacho>
Hidakagawacho is located near the center of the Hidaka River, which runs horizontally close to the center of Wakayama Prefecture. It belongs to the Kii mountain range. Hidakagawacho was selected by the National Land Agency of 1996 as one of the "best 100 water villages" and is blessed with an abundance of nature. In May 2000, Wakayama Prefecture's Hidakagawacho (once Miyama-mura) became a friendship city with Osakasayama city. Since then, there has been mutual exchange with outdoor activities for the youth, events such as the firefly festival and Sayama Pond festival, which have all been very successful.