This thing is called flying fox here. According to Wikipedia, the term is of Australian and New Zealandian origin. In the United States it's called zip-lines, and in the UK it's aerial runways.
Flying fox is getting very popular here. Many recreational places and camping grounds have this equipment now. This one is at Vin's Berry, a berry farm and camping ground on Kolonel Masturi Street, in the north of Bandung, where my son had an outbound camp with his school friends yesterday and today. My son loved it very much and wanted to repeat it again and again. As for me, I just watched and photographed the children doing this.
