After the Chinese reconquered Turkestan in 1878, renaming it Xinjiang, they again reverted to their traditional boundary. By now, the Russian Empire was entrenched in Central Asia, and the British were anxious to avoid a common border with the Russians. After creating the Wakhan corridor as the buffer in the northwest of Kashmir, they wanted the Chinese to fill out the no man's land between the Karakoram and Kunlun ranges. Under British (and possibly Russian) encouragement, the Chinese occupied the area up to the Yarkand River valley (called Raskam), including Shahidulla, by 1890. They also erected a boundary pillar at the Karakoram pass by about 1892. These efforts appear half-hearted. A map provided by Hung Ta-chen, a senior Chinese official at St. Petersburgh, in 1893 showed the boundary of Xinjiang up to Raskam. In the east, it was similar to the Johnson line, placing Aksai Chin in Kashmir territory.