﴿ كَذَٰلِكَ وَقَدْ أَحَطْنَا بِمَا لَدَيْهِ خُبْرًۭا ﴾

“thus [We had made them, and thus he left them; and We did encompass with Our knowledge all that he had in mind”

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.