There are 3 contributory valleys that make up together Gagai Nallah.
All three lead to 3 different treks from Kashmir to Baltistan around Minimarg and Kala pani region:
1- Taobat - Kamri pass - Minimarg
2- Taobat - Kala pani pass - Kala pani
3- Taobat - unnamed pass - Finishes at villages between Kala pani and Chechri Kadal
The route coming from Astore divides into 4 valleys:
1- Chillam valley
2- Rattu and Kala pani
3- Rattu and Shounter side
4- Trashing and Rupal side