he has set up on the earth firm mountains lest it shake under you and rivers and tracks so that you may find your way and he has set up other landmarks. by these and by the stars people set their course.
وألقى في الأرض رواسي أن تميد بكم وأنهارا وسبلا لعلكم تهتدون وعلامات وبالنجم هم يهتدون