וְזֶֽה־יִהְיֶ֥ה לָכֶ֖ם גְּב֣וּל צָפ֑וֹן מִן־הַיָּם֙ הַגָּדֹ֔ל תְּתָא֥וּ לָכֶ֖ם הֹ֥ר הָהָֽר׃
Voici quelles seront vos bornes au nord: vous tracerez une ligne de la grande mer à Hor-la-Montagne;
Rashbam on Numbers
תתאו, drawing a boundary (presumably where there are no recognisable landmarks. Ed.]
Siftei Chakhamim
And some outward. Meaning that on the western side [the sea] circles the mountain on the inner side, i.e., the side of the land of Israel, and on the outer side, meaning outside the land.