Surah An-Nahl 16:15

وَأَلْقَىٰ فِى ٱلْأَرْضِ رَوَٰسِىَ أَن تَمِيدَ بِكُمْ وَأَنْهَـٰرًا وَسُبُلًا لَّعَلَّكُمْ تَهْتَدُونَ

And He has cast into the earth firmly set mountains, lest it shift with you, and [made] rivers and roads, that you may be guided,

Translation: Saheeh International

Tafsir

And He cast into the earth firm mountains lest it should shake move with you and He made therein rivers such as the Nile and ways roads so that you might be guided to your destinations

Excerpt from Tafsir al-Jalalayn, commentary on 16:15, via Quran.com. The reader has the full commentary and 9 more tafsirs.