The shore line is broken on both sides by the estuaries of several rivers.
About two dozen ugly-looking species inhabit rivers and estuaries from Bengal to Australia.
The crocodile is common in many of the rivers and estuaries of Siam, and there are many lizards.
Oysters are found in large numbers in the estuaries and fixed to the submerged parts of the mangroves.
The scenery of the neighbouring Orwell and Stour estuaries is pleasant.