18 “Next they traveled through the wilderness, skirted the lands of Edom and Moab, passed along the eastern side of the country of Moab, and camped on the other side of the Arnon. They did not enter the territory of Moab, for the Arnon was its border.

Read Judges 11:18 Using Other Translations

Then they went along through the wilderness, and compassed the land of Edom, and the land of Moab, and came by the east side of the land of Moab, and pitched on the other side of Arnon, but came not within the border of Moab: for Arnon was the border of Moab.
"Then they journeyed through the wilderness and went around the land of Edom and the land of Moab and arrived on the east side of the land of Moab and camped on the other side of the Arnon. But they did not enter the territory of Moab, for the Arnon was the boundary of Moab.
“Finally, they went around Edom and Moab through the wilderness. They traveled along Moab’s eastern border and camped on the other side of the Arnon River. But they never once crossed the Arnon River into Moab, for the Arnon was the border of Moab.