Tortoise Mountain has over 100,000 mu azalea (Rhododendronsimsii), with trees aged at 100 years old. The biggest azalea trees can have as many as 56 branches with trunk branches ranging from 6-10cm in diameter. The crown stretches six meters in diameter and covers 35 square meters. It is the largest century-old Rhododendronsimsii ecological colony in the country. Compared with ordinary azalea colonies, Tortoise Mountain colony has experienced natural evolution over millions of years. The vegetation colony has been well preserved. It is spread wide and high (31 degrees northern latitude and 1,200 meters above the sea level), is concentrated in large areas and is of high botanical and ecological values. These are the most ideal samples to study ancient azalea colonies. The colony is unique in the world and important for scientific research because it is old and well preserved with wide coverage.