The hot spring of Kim Boi is located in Kim Boi District, Hoa Binh Province, 30km from Hoa Binh Town. The house was built near a large mineral water pool. Visitors sitting inside the house can hear the sound of the water, which is at a constant temperature of 36°C, continuously spouting out. Scientific tests have shown that the mineral water at Kim Boi is suitable to drink, bathe, and use in the treatment of rheumatism, intestinal diseases, stomachache, and high-blood pressure.

Kim Boi mineral water is bottled for drinking. It has almost the same composition as certain well-known foreign brands of mineral water.