In January 1896, after a stopover in Kashgar, Hedin visited the 1,500-year-old abandoned cities of Dandan Oilik and Kara Dung, which are located northeast of Khotan in the Taklamakan Desert. At the beginning of March, he discovered Lake Bosten, one of the largest inland bodies of water in Central Asia. He reported that this lake is supplied by a single mighty feeder stream, the Kaidu River. He mapped Lake Kara-Koshun and returned on 27 May to Khotan. On 29 June, he started out from there with his caravan across northern Tibet and China to Beijing, where he arrived on 2 March 1897. He returned to Stockholm via Mongolia and Russia.