In The Name of Allaah, The Most Merciful, The Bestower of Mercy.
Allaah [The Exalted] said:
وَأَلۡقَىٰ فِى ٱلۡأَرۡضِ رَوَٲسِىَ أَن تَمِيدَ بِڪُمۡ وَأَنۡہَـٰرً۬ا وَسُبُلاً۬ لَّعَلَّڪُمۡ تَہۡتَدُونَ
وَعَلَـٰمَـٰتٍ۬ۚ وَبِٱلنَّجۡمِ هُمۡ يَہۡتَدُونَ
And He has affixed into the earth mountains standing firm, lest it should shake with you, and rivers and roads, that you may guide yourselves. And landmarks (signposts, etc. during the day) and by the stars (during the night), they (mankind) guide themselves. [Surah An-Nahl. Aayaat 15-16]
Meaning: Allaah [The Exalted] placed mountains in the earth for the sake of His slaves – gigantic mountains, so that the earth does not shake and convulse with the people [living on it]. So, they are able to cultivate the land, build on it and traverse on it. And from His [Perfect] Mercy is that He placed rivers in the earth, which flows [by His Will] from a faraway land to a land that is greatly in need of it, so that the people receive water, give to their animals and water their crops – rivers that run on the outer layer of the earth and rivers that are underneath the earth which people obtain by way of digging, until they reach it and bring it out by way of that which Allaah has subjugated to them, such as containers, appliances and what is similar to them. And from His [Perfect] Mercy is that He placed [spaces on the earth that can be used] as roads which link lands that are far away from each other, so that you may guide yourselves to those lands, to the extent that you find a land that is encircled by a chain of mountains, however Allaah has placed spaces and mountain passages in them for the people to walk. [An Excerpt from Tafseer As-Sadi. Slightly paraphrased]
Read: Keeping a Stationary Earth Moving Through Imaginary Physics and Propping Up the Cosmic Religion of Giordano Bruno