It was narrated from Anas that the Messenger of Allah ﷺ said:
“The distance between the two ends of my Cistern is like the distance between San’a and Al-Madinah,’ or ‘between Al-Madinah and ‘Amman.’”

حَدَّثَنَا نَصْرُ بْنُ عَلِيٍّ، حَدَّثَنَا أَبِي، حَدَّثَنَا هِشَامٌ، عَنْ قَتَادَةَ، عَنْ أَنَسٍ، قَالَ قَالَ رَسُولُ اللَّهِ ﷺ " مَا بَيْنَ نَاحِيَتَىْ حَوْضِي كَمَا بَيْنَ صَنْعَاءَ وَالْمَدِينَةِ أَوْ كَمَا بَيْنَ الْمَدِينَةِ وَعَمَّانَ " .