וַֽיַּעֲל֖וּ וַיָּתֻ֣רוּ אֶת־הָאָ֑רֶץ מִמִּדְבַּר־צִ֥ן עַד־רְחֹ֖ב לְבֹ֥א חֲמָֽת׃
So they went up, and spied out the land from the wilderness of Zin unto Rehob, at the entrance to Hamath.
Read kabbalistic (mystical) interpretation of Numbers 13:21: and classical mystical sources.