- Visitors to Bac Yen mountain district in Son La province can now explore Pu Nhi farm to enjoy its pristine beauty in addition to discovering Khe Ho ancient stone beach, A Phu cave, Hua Nhàn lotus lake, and the Dinosaur Backbone peak of Ta Xua, a high mountain range often called "paradise in the clouds". Pu Nhi farm has a stunning landscape, cool temperatures, and fresh air.