The observation and meanings to the nature geography of southwest region in the Tang and Song Dynasties

Because of geography environment and national political center always in northwest China, the southwest region isolates with always opposite closing of China since Pre-Qin, Very few for the hinterland understands to the southwest region before the Tang Dynasty. As the enhance to political and economy relation between center king and southwest region and the prosperous of geography,many scholars are interesting in southwest mountain and stream geography, plant animals etc. proceeded the meticulous observation and record. left a precious history cultural heritage, and represented the level of cognition to southwest region in the medieval times period.