《汉书·传·西域传上》
然而楼兰国在西域的束边，靠近汉朝，正当白龙堆处，少水草，常为漠使派向导，背水担粮，送迎汉使，又多次被汉朝的吏卒抢劫，他们的教训是与汉往来没有好处。
然楼兰国最在东垂，近汉，当白龙堆，乏水草，常主发导，负水儋粮，送迎汉使，又数为吏卒所寇，惩艾不便与汉通。
However, Loulan was located in the Xiyu region, bordering the Han Dynasty. It was located at the White Dragon Dune, where there was little water and grass. It often served as a guide for the Han emissary, carrying water, carrying food, and welcoming and sending off the Han emissary. It was often plundered by the Han officials and soldiers. They learned that there was no benefit in associating with the Han Dynasty.