The winding uphill slope is very steep.
The clouds are so remote that guns smell the sky (excerpt from the poem Tay Tien - Quang Dung)
Known as the four great mountain passes: Ma Pi Leng in Ha Giang, O Quy Ho in Lao Cai - Lai Chau, Khau Pha in Yen Bai and Pha Din in Son La - Dien Bien, they are not only famous passes but also symbols of majesty, challenging the courage of those who love to explore. The common feature of these passes is that they are concentrated in provinces with high mountains, a prerequisite for creating winding roads around the mountainside with large scale and steepness.
Heritage Magazine
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