Hoanh Son Quan helped control entry and exit at Ngang Pass. The ‘sky gate’ is situated at the highest point of Ngang Pass. It is commonly held that the sky can be touched when reaching Hoanh Son Quan.
Hoanh Son Quan, named ‘sky gate’ border of Ha Tinh and Quang Binh:
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Two windows at the back of a cafe in tourism hotspot Hoi An