藏族是我国历史悠久的民族之一。西藏山峦连绵,雪山重叠,平均海拔高度4000m以上,素有“世界屋脊”之称。全区地形可分为藏北高山、藏东高山峡谷、藏南谷地和喜马拉雅山山地四区。河流有外流河和内流河。西藏是中国湖泊最多的地区,有大小湖泊1500多 Tibetans are one of the nations with a long history in our country. Tibet hills, snow-capped mountains overlap, the average altitude of 4000m above, known as the “roof of the world,” said. The terrain can be divided into northern Tibet high mountains, Tibetan mountains alpine gorge, southern Tibet and the Himalayas mountains four areas. Rivers have outflows and inflows. Tibet is the largest lake in China with more than 1,500 lakes and lakes