Tafsir of Az-Zukhruf 43:10

الذي جعل لكم اﻻرض مهدا

Who has made for you the earth like a bed, means, smooth, stable and firm, so that you can travel about in it, and stand on it and sleep and walk about, even though it is created above water, but He has strengthened it with the mountains, lest it should shake.

وجعل لكم فيها سبﻼ

and has made for you roads therein, means, paths between the mountains and the valleys.

لعلكم تهتدون

in order that you may find your way. means, in your journeys from city to city, region to region, land to land