《山海经·山经·北山经》
再往北三百五十里，是座敦头山，山上有丰富的金属矿物和玉石，但不生长花草树木。
又北三百五十里，曰敦头之山，其上多金玉，无草木。
Three hundred and fifty li further north, there is a mountain called Duntou Mountain, where there are abundant metallic minerals and jades, but no flowers, grass, or trees.