Phukhao Thong (ภูเขาทอง) is a subdistrict ("tambon") in the Phra Nakhon Si Ayutthaya province, administrated by Phra Nakhon Si Ayutthaya district in central Thailand. The subdistrict is located on the Chao Phraya river about 71 km north of Bangkok and about 3 km north-west of the city of Ayutthaya....