Al-Kahf 18:96 اتوني زبر الحديد حتى اذا ساوى بين الصدفين قال انفخوا حتى اذا جعله نارا قال اتوني افرغ عليه قطرا ٩٦

His Journey to the Land of Ya'juj and Ma'juj, and building the Barrier

Allah says of Dhul-Qarnayn:

(Then he followed (another) way) meaning, he traveled from the east of the earth until he reached a place between the two mountains which were next to one another with a valley i