尼雅遗址分布在古尼雅河尾闾冲积扇上,原先这里的河网很密,干涸的古河床随处可见。由于大多为流沙所掩埋,现在很难看到其全貌。不过从卫星遥感图像上,却可以清楚地看出古尼雅河尾闾的河网呈马尾状散开.多作南北流。密如蛛网般的河道,为引水灌溉提供了方便,然而也为旅行交通造成了困难。唐玄奘从印度取经归来时曾经过这里。由于河流纵横,沼泽遍布,他费了很大的周折,才找到了过河的途径。唐代时,尼 Niya sites located in the alluvial fan of the ancient Niya River tail, the original network here is very dense, dry ancient river bed everywhere. As most of the quicksand buried, it is difficult to see the full picture. However, satellite remote sensing images, but it is clear that the ancient Niya River tail river network was caudal scattered. A dense, cobweb-like channel provides convenient access to water for irrigation but also creates difficulties for travel and transportation. Tang Xuan Zang had come here from India when he was studying. Due to the vertical and horizontal rivers and marshes, he spent a lot of twists and turns before finding a way to cross the river. When the Tang Dynasty, Nepal