﴿ وَجَعَلْنَا بَيْنَهُمْ وَبَيْنَ ٱلْقُرَى ٱلَّتِى بَٰرَكْنَا فِيهَا قُرًۭى ظَٰهِرَةًۭ وَقَدَّرْنَا فِيهَا ٱلسَّيْرَ ۖ سِيرُوا۟ فِيهَا لَيَالِىَ وَأَيَّامًا ءَامِنِينَ ﴾

“Now [before their downfall,] We had placed between them and the cities which We had blessed [many] towns within sight of one another; and thus We had made traveling easy [for them, as if to say]: “Travel safely in this [land], by night or by day!””

Please check ayah 34:19 for complete tafsir.