Excuse me, if I want to enter Nepal by land and then fly back to Lhasa, what procedures do I need to go through? Do I need to apply for a border card besides a visa? if

If you enter Nepal by land from China, you will leave through Zhangmu Port. If you want to apply for a border card at the location of your hukou, you can apply for a visa at the Nepalese Consulate in Lhasa. A border card can be filled in Linzhi area, Shannan area, Xigaze area, Ali area and Zhangmu area of Mount Everest.