Surah Fatir 35:12

وَمَا يَسْتَوِى ٱلْبَحْرَانِ هَـٰذَا عَذْبٌ فُرَاتٌ سَآئِغٌ شَرَابُهُۥ وَهَـٰذَا مِلْحٌ أُجَاجٌ ۖ وَمِن كُلٍّ تَأْكُلُونَ لَحْمًا طَرِيًّا وَتَسْتَخْرِجُونَ حِلْيَةً تَلْبَسُونَهَا ۖ وَتَرَى ٱلْفُلْكَ فِيهِ مَوَاخِرَ لِتَبْتَغُوا۟ مِن فَضْلِهِۦ وَلَعَلَّكُمْ تَشْكُرُونَ

And not alike are the two seas [i.e., bodies of water]. One is fresh and sweet, palatable for drinking, and one is salty and bitter. And from each you eat tender meat and extract ornaments which you wear, and you see the ships plowing through [them] that you might seek of His bounty; and perhaps you will be grateful.

Translation: Saheeh International

Tafsir

Nor are the two kinds of seas alike this one is extremely sweet pleasant to drink and that one is salty extremely bitter. Yet from each of the two you eat fresh meat namely fish and obtain from the salt — and it is also said from both of them — ornaments which you wear namely pearls and coral. …

Excerpt from Tafsir al-Jalalayn, commentary on 35:12, via Quran.com. The reader has the full commentary and 9 more tafsirs.