Welcome to Tatopani to Marpha
Here, in its upper reaches, people call the Kali Gandaki the Thak Khola, thus the name Thakali for those who live in this region. Ghasa (2010m) is the first Thakali village on the road north and the southernmost limit of Tibetan Buddhism in the valley. At Ghasa there is an ACAP checkpost where you will need to show your permit. Also, because you are moving from one jurisdiction to another, the bus companies can make you change vehicles here. This was not the case at the time of writing, but it could be reintroduced.