His fourth journey in 1883-1885 was to Sining (the great trade centre of the Chinese borderland), and thence through northern Tibet (crossing the Altyn Tagh to Lop Nor), and by the Cherchen-Keriya trade route to Khotan.
Both are directed and controlled by the high Chinese officials residing at Lhasa, Sining Fu; and the capital of the Chinese province of Szechuen.
Northeastern Tibet or Amdo, and also a portion of Khamdo, are under the supervision of a high official (Manchu) residing at Sining Fu in Kansuh, whose title is Imperial Controller-General of Koko Nor.
Minor roads go from Sining Fu in the Chinese province of Kansuh via Tsaidam and the Tang la pass to Nagchuka and Lhasa.
Then pushing on southwards, he crossed the Nienchen-tang-la and entered the Dam district near the Lhasa-Sining high road.
Crossing the Sining-Lhasa road a little south of the Dang la range, and about two days' journey north of Nagchuka, Captain Bower crossed the Su chu, and following a course parallel to the Giama-nu chu, he made his way to Riwoche and thence to Chiamdo, from which town he followed the Lhasa-Tachienlu high road to the latter town, which he reached on the 10th of February 1892.
From this point she seems to have followed the Chiamdo road to near that town, when she turned westwards and continued in that direction till she came on the high road from Lhasa to Sining Fu somewhere north of Nagchuka.
Here they were finally stopped by the Tibetans, and after a delay of six weeks passed in vain attempts to obtain permission to go to Lhasa, they were only allowed to proceed to Nagchuka on the Sining-Lhasa road, and to continue by the Gyade route to Yekundo, near the upper Dre chu, and thence to Sining in Kansuh.
Reaching Yekundo (or Giergundo) on the 21st of May 1894, the travellers started for the Koko Nor and Sining on the 1st of June; but the party was attacked near Tungbumdo (Tumbumdo of previous travellers), and Dutreuil de Rhins was killed on the 5th of June.
M Grenard after a few days resumed his march, passed east of the Noring t'so, the eastern extremity of Tosu Nor, and thence by the south-east corner of Koko Nor to the town of Sining Fu in Kansuh.
Passing into the valley of the Nomoron Gol, south of the Tsaidam, they made their way by Barong Tsaidam to Donkyr and Sining Fu by the high road along the northern shore of the Koko Nor.