Where is the best scenery in Tibet?

See if you are going to the cultural scenery or the natural scenery.

Potala Palace, Jokhang Temple, Jokhang Temple, Norbulingka, Tashilhunpo Temple, Sera Temple, drepung monastery, Gandan Temple, Sera Temple, Barkhor Street and other cultural landscapes are all worth visiting, among which Potala Palace, Jokhang Temple and Tashilhunpo Temple are national 5A-level scenic spots. Basongcuo, Namco, Yang Zhuo Yongcuo and other natural scenery, among which Basongcuo is a national 5A-level scenic spot. Tibet has four scenic spots in the past five years, three cultural scenic spots and 1 natural scenic spot-Basongcuo.

If you mean natural scenery, Ba Songcuo is the first one.

Basongcuo Lake, also known as Cuogo Lake, means "green water" in Tibetan and has the reputation of "outdoor paradise". It is a famous Catholic holy lake, with a length of about 12 km, the deepest point of more than 60 meters and a total area of more than 6,000 mu. The shape of the lake is like a crescent moon, embedded in a high mountain canyon. The lake is crystal clear and surrounded by snow. Sha Ou and crane float on the lake, which is transparent and full of fish. There is Cuozong Gongba Temple on Tashi Island in the middle of the lake, which was built in the late Tang Dynasty. The reefs on the island are carved into unique animal images and Buddha statues. Cuozong Temple is a civil structure, with two floors, dedicated to Qiangbafo, Thousand-handed Guanyin and the golden married couple.