Charts. Siam Gulf of. Gulf of Siam, Siam and French Indo-China, Cape Liant (Lem Samesan) to Kut Island, from latest British and Siamese surveys; with inset Chandaburi (Chentabun) River and approaches, from Siamese survey in 1912 and 1913; chart 3137. Natural scale 1:293,547 at lat. 12°.