In the south of Krabi province in Klong Thom district (around 70km from town and near the Khao Phra Bang Khram Nature Reserve), are nature’s own hot-tub jacuzzis, known as น้ำตกร้อน (nam tok rawn) in Thai. The water here comes from thermal springs, originating deep underground in volcanic chambers. Located in the jungle, this site features naturally hollowed-out ‘bathtubs’ in the smooth stone, filled to the brim with fresh running spring water at a pleasant 35-42C. After a soak, take a refreshing dip in the cool river below.