《徐霞客游记·粤西游日记三十七》
思恩县西部边界上有个河背岭，极高峻，是艰险可怕的道路，终日无人，往西走到茅滥然后进入荔波县境内，才能征用脚夫前去。
思恩西界有河背岭，极高峻，为畏途，竟日无人，西抵茅滥而后入荔波境，始可起夫去。
On the western border of Sian county, there was a Hebei Ridge, extremely steep and a difficult and frightening path, deserted all day long. Going west to Maolan and then entering the territory of Liping County, one could requisition porters to go there.