﴿ حَتَّىٰٓ إِذَا بَلَغَ مَطْلِعَ ٱلشَّمْسِ وَجَدَهَا تَطْلُعُ عَلَىٰ قَوْمٍۢ لَّمْ نَجْعَل لَّهُم مِّن دُونِهَا سِتْرًۭا ﴾

“[And then he marched eastwards] till, when he came to the rising of the sun he found that it was rising on a people for whom We had provided no coverings against it:”

Dhu’l-Qarnayn’s next expedition was towards the east of Iran. He reached a place where a most uncivilised people were living. The description that there was no barrier (shelter) between them and the sun means perhaps that they were nomads and were living on open ground instead of in properly constructed houses.