Bight of Ayodhya

At the head of the Gulf of Siam, a shallow bight receives the waters of the Chao Phraya, Tha Chin, Mae Klong and Bang Pakong rivers. The rivers spread sediment across a low coast of mudflats and estuaries, where tides push inland against their flow. The Chao Phraya provided access from the sea to the rich central plain and the royal city of Ayutthaya, making these waters the maritime approach to the heart of Siam.