Phra Nakhon Si Ayutthaya (Thai: พระนครศรีอยุธยา, pronounced [pʰráʔ ná(ʔ).kʰɔ̄ːn sǐː ʔā.jút.tʰā.jāː]; also spelled “Ayudhya”), or locally and simply Ayutthaya, is the former capital of Phra Nakhon Si Ayutthaya province in Thailand. Located in the valley of the Chao Phraya River.