What do you mean by Baise and chaubise kingdome?

Explanation:

Unlike today, history of Nepal suggest that it used to be divided into small states. These small states were called baise and chaubise rajya.

Baise rajya literally means 22 principalities of Nepal which was located around Karnali Bheri river, Likewise Chaubise rajya denoted 24 principalities of Nepal.

the answer to your question is a. the salt plains

in 1811, he led an expedition, known as the george c. sibley expedition, to improve relations with the pawnee and kansa tribes, and also to locate the rumored jefferson's salt mountain