Chinese reusable rocket Tianlong-3 accidentally launched during static test fire
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The video shows a mostly-forested area. The big building right next to the smoke cloud probably belongs to the engine test facility.
As far as I can tell, the area administratively belongs to Dayugou Zhen, a small town with 40k inhabitants spread across 2 communities and 22 villages. https://zh.wikipedia.org/wiki/%E5%A4%A7%E5%B3%AA%E6%B2%9F%E9...