Surah An-Naml
أَمَّن جَعَلَ ٱلْأَرْضَ قَرَارًا وَجَعَلَ خِلَـٰلَهَآ أَنْهَـٰرًا وَجَعَلَ لَهَا رَوَٰسِىَ وَجَعَلَ بَيْنَ ٱلْبَحْرَيْنِ حَاجِزًا ۗ أَءِلَـٰهٌ مَّعَ ٱللَّهِ ۚ بَلْ أَكْثَرُهُمْ لَا يَعْلَمُونَ
Am man ja‘alal-arḍa qarāraw wa ja‘ala khilālahā anhāraw wa ja‘ala lahā rawāsiya wa ja‘ala bainal-baḥraini ḥājizā(n), a'ilāhum ma‘allāh(i), bal akṡaruhum lā ya‘lamūn(a).
Is He [not best] who made the earth a stable ground and placed within it rivers and made for it firmly set mountains and placed between the two seas a barrier? Is there a deity with Allah? [No], but most of them do not know.
📝 Footnotes
555) The expression "two seas" in this verse refers to the salty sea and a large river that flows into it. Upon reaching the estuary, the fresh water of the river does not immediately turn salty.