FACTBOX - Tibet, Dalai Lama and relations with China

(Reuters) - Chinese officials have declared a "people's war" of security and propaganda against support for the Dalai Lama in Tibet after riots racked the regional capital Lhasa, and some sources claimed the turmoil killed dozens.

The demonstrations, which also spilled into Chinese provinces populated by Tibetans, began early last week after marches around the world to mark the 49th anniversary of a failed uprising against Communist rule.

Following are some facts about Tibet, the Dalai Lama and relations with China:

TIBET:

* Occupying a large, high-altitude and sparsely populated plateau, Tibet is known as the 'roof of the world.'

* The People's Liberation Army marched into the Himalayan region in 1950.

* Wedged between the Himalayan mountain range to the south and the Kunlun range in the north, Tibet borders Myanmar, India, Bhutan and Nepal.