Following are a number of back-translations as well as a sample translation for translators of Joshua 12:1:

• Kupsabiny: “The people of Israel defeated the kings who lived east of the river Jordan. They also took their countries from the valley of Arnon in south to mount Hermon in north.” (Source: Kupsabiny Back Translation)
• Newari: “The people of Israel conquered the land on the eastern side of the Jordan River from the Arnon Gorge in the south to Mt Hermon in the north, that is, the entire eastern side of the Arabah, these are name of the kings of that land.” (Source: Newari Back Translation)
• Hiligaynon: “The Israelinhon had- now -subjected/brought-under-(their)-jurisdiction the land in the east of Jordan, from the Arnon channel/water-course/place-where- the water -flows up-to the Mountain of Hermon, including now here the land in/to the east of the Valley of Jordan. These are the kings in those places who were-defeated by the Israelinhon:
  Sihon the Amornon who was-living in Heshbon. The jurisdiction of his kingdom (was) half of Gilead. This (was) from Aroer beside the Arnon channel/water-course of water, and from this half up-to the River of Jabok, the border of the Ammonhon.” (Source: Hiligaynon Back Translation)
• English: “The Israelis took control of the land that was east of the Jordan River, from the Arnon River gorge in the south to Hermon Mountain in the north, including all the land on the eastern side of the Jordan River Valley. That land previously belonged to the two kings whose armies the Israelis defeated.” (Source: Translation for Translators)