One of the most repeated objections claims the Quran teaches that the sun literally sets in a pool of muddy water - a childish cosmology that would expose the book as unscientific. The verse is doing nothing of the kind: it reports what a traveller saw from where he stood, in ordinary observational language.
The verse and the objection
Until, when he reached the setting-place of the sun, he found it setting in a spring of murky water, and he found near it a people...
Quran 18:86
Critics read this as a factual cosmological claim: that the sun physically descends into a muddy spring at the edge of a flat earth. From there they conclude the Quran endorses a false, primitive picture of the world.
It describes what was seen, not where the sun rests
The key phrase is wajadahā taghrubu (وَجَدَهَا تَغْرُبُ) - "he found/saw it setting." The verb is one of perception. The verse reports Dhul-Qarnayn's observation from his vantage point, not a statement about the sun's actual physical location.
This is completely ordinary language, then and now. A person standing on a shoreline can truthfully say, "I watched the sun sink into the ocean," and no one imagines the sun has entered the water. The Quran is narrating the scene as it appeared to the traveller who had journeyed west until the sun appeared, from where he stood, to set into a dark body of water. Describing an appearance is not asserting a mechanism.
The two established readings of the spring
There are two accepted Quranic recitations of the phrase, both linguistically valid:
- ʿaynin ḥamiʾah - a muddy or dark spring.
- ʿaynin ḥāmiyah - a hot spring.
Al-Tabari, among the earliest and most authoritative commentators, recognized both readings as established and sound. Either way, the object being described is a real body of water on the earth's surface, into which the sunset appeared to descend.
The classical commentators already said this
This is not a modern rescue. Classical tafsir explicitly noted that the meaning is that the sun appeared to set there "in the sight of the eye," or that it set beside the spring - i.e. the description is observational, from the viewer's perspective, not a claim about the sun's true resting place.
The context settles it
The same verse immediately continues:
...and he found near it a people.
Quran 18:86
This is decisive. Dhul-Qarnayn reaches a geographical location - one that contains water and a human community. People do not live at the cosmic edge where a literalist reading would place the sun. The passage is plainly describing him arriving at a western coast, lake, marsh, or spring inhabited by a people, where the sunset met the water on the horizon. The narrative frame is travel and geography, not astronomy.
The objection reads against the grain of the text
To manufacture the error, the critic must (1) ignore that the verb is one of seeing, (2) treat a description of appearance as a claim of physical fact, and (3) overlook the "people living there" that anchors the scene to an ordinary place on earth. Each move is made against the verse, not with it. Many modern translations simply make the observational sense explicit ("he found it setting, as it seemed to him...") - not to patch a problem, but to convey what the Arabic always meant.
Conclusion
The Quran does not say the sun sets in muddy water. It reports what Dhul-Qarnayn saw as he reached an inhabited western shore - the sun appearing, from his position, to set into a dark or hot spring. This is the same everyday observational language every human being uses about sunsets, understood exactly this way by the classical commentators. The objection mistakes a description of perspective for a statement of cosmology.
For a deeper treatment of this verse and the story of Dhul-Qarnayn, see the related topics below.