At a point a little more than halfway down its course, the Menam Chao Phaya receives the waters of its only tributary, the Nam Sak, a good-sized stream which rises in the east of northern Siam and waters the most easterly part (the Pechabun valley) of that section of the country.
X) through the intermediate sounds kj, fj, ~j: chamar (c 1 a m a r e), chao (p 1 a if u s), chamma (f 1 a m m a).
The word was suggested by the Gr.)(etas, chaos, for he also writes: "I have called this spirit gas, it being scarcely distinguishable from the Chaos of the ancients" ("halitum illum Gas vocavi, non longe a Chao veterum secretum").
The Kwei-kiang, on the other hand, takes a southerly course, and passes the cities of Kwei-lin, Yang-so Hien, ring-le Fu, Chao-Ong Hien, and so finds its way to Wu-chow Fu, where it joins the waters of the Si-kiang.
(For map, see Indo-China.) The country may be best considered geographically in four parts: the northern, including the drainage area of the four rivers which unite near Pak-Nam Po to form the Menam Chao Phaya; the eastern, including the drainage area of the Nam Mun river and its tributaries; the central, including the drainage area of the Meklong, the Menam Chao Phaya and the Bang Pakong rivers; and the southern, including that part of the country which is situated in the Malay Peninsula.