Where is Hulongshan?

What you should say is Dragon and Tiger Mountain.

Longhu Mountain is located in guixi city, 20 kilometers southwest of Yingtan City, Jiangxi Province. In the middle of the Eastern Han Dynasty, Zhang Daoling, the founder of Zhengyi School, was an alchemist here. It is said that "when the Dragon and Tiger were born in Dan, the mountain was named after it". Tianmen Mountain is the highest, with an altitude of 1300m. Longhu Mountain is the eighth world natural heritage, world geological park, national natural and cultural heritage site, national AAAAA-level tourist attraction and national key cultural relics protection unit in China.