Narrated Ibn 'Umar:

The Prophet ﷺ said, "There will be a tank (Lake-Fount) in front of you as large as the distance between Jarba and Adhruh (two towns in Sham)."

حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا يَحْيَى، عَنْ عُبَيْدِ اللَّهِ، حَدَّثَنِي نَافِعٌ، عَنِ ابْنِ عُمَرَ ـ رضى الله عنهما ـ عَنِ النَّبِيِّ ﷺ قَالَ
" أَمَامَكُمْ حَوْضٌ كَمَا بَيْنَ جَرْبَاءَ وَأَذْرُحَ ".