Do ads in Shannan, Tibet have to be in Tibetan?

Not necessarily.

According to inquiries from the People’s Government of the Tibet Autonomous Region, advertisements in Shannan, Tibet do not necessarily have to be in Tibetan. However, since Tibetan is the official script in Tibet, using Tibetan can make it easier for local Tibetan people to identify and understand advertising information, and it is also conducive to maintaining and inheriting Tibetan writing and culture. In addition, Tibetan is also widely used in tourism, culture, education and other fields, so using Tibetan for advertising in these fields can better attract the target audience.

Shannan City, historically known as "Yalong", is a prefecture-level city under the jurisdiction of the Tibet Autonomous Region. It is located in the middle and lower reaches of the Yarlung Zangbo River south of the Gangdise Mountains on the Qinghai-Tibet Plateau to the Nyainqentanglha Mountains. It is an ancient civilization in Tibet. One of the birthplaces of Tibet, it is said that the combination of the divine monkey and the Rakshasa girl gave birth to the Tibetan people. It has a long history and splendid culture.