וְעָבַ֣ר עַצְמ֗וֹנָה וְיָצָא֙ נַ֣חַל מִצְרַ֔יִם והיה [וְהָי֛וּ] תֹּצְא֥וֹת הַגְּב֖וּל יָ֑מָּה זֶה־יִהְיֶ֥ה לָכֶ֖ם גְּב֥וּל נֶֽגֶב׃
E passou por Atzmotá, e saiu pelo rio de Mitzrayim, e as saídas do limite serão até o mar Ocidental; este será para vós o limite do sul.
Rashi
Extended. The end of the border was at the Great Sea,6The Mediterranean Sea. which is the western border of all of Eretz Yisroel. Thus the boundary of Yehudah occupies the entire length of Eretz Yisroel from east to west and is located in the south of Eretz Yisroel.