اَللَّهُمَّ حَوَالَيْنَا وَلَا عَلَيْنَا، اَللَّهُمَّ عَلَى الْآكَامِ وَالظِّرَابِ وَبُطُونِ الْأَوْدِيَةِ وَمَنَابِتِ الشَّجَرِ
Transliteration
Allahumma hawalayna wa la 'alayna, Allahumma 'alal-akami waz-zirabi wa butunil-awdiyati wa manabitish-shajar
English meaning
O Allah, around us and not on us. O Allah, on the hills, the mountains, the valleys, and where trees grow.
When is it recited?
In times of excessive rain or flooding.
Source
Bukhari, Istisqa' 22