John Gill Commentary Numbers 33:40

"And the Canaanite, the king of Arad, who dwelt in the South in the land of Canaan, heard of the coming of the children of Israel." — Numbers 33:40 (ASV)

Ver. 40-44. And King Arad the Canaanite
Or the king of Arad the Canaanite: which dwelt in the land of Canaan, he heard of the coming of the
children of Israel ;
towards the land of Canaan, in order to possess it, and he came out and fought with them, and was vanquished; see (Numbers 21:1–3) , this was when Israel was at Mount Hor; from where they departed to Zalmonah, twenty eight miles from the mount; and from thence to Punon, which was twenty more; and so to Oboth, which was twenty four miles from Punon: and thence

to Ijeabarim, in the border of Moab ,
which was sixteen miles, see (Numbers 21:9–11) .