<prompt> Bhala okuqhubekayo kwalesi sigaba - i-Upper Mustang isendleleni yasendulo yokuhweba phakathi kweNepal neTibet isebenzisa ipasi eliphansi kakhulu iKora La ngokusebenzisa iHimalaya entshonalanga yeSikkim. Lo mzila waqhubeka usetshenziswa kwaze kwaba yilapho iChina ihlanganisa iTibet  <response>: ngo-1950. 