Charles Ellicott Commentary Numbers 20:17

"Let us pass, I pray thee, through thy land: we will not pass through field or through vineyard, neither will we drink of the water of the wells: we will go along the king`s highway; we will not turn aside to the right hand nor to the left, until we have passed thy border." — Numbers 20:17 (ASV)

We will go by the king’s highway.— It is supposed that this military road led through the broad Wady el Ghuweir, which is celebrated for its excellent pasture and its numerous springs. (See Keil on this passage)