Mekhong
or MEKONG (mā-kong'), the greatest river of the Siam peninsula usually identified with the Lan-tsan, which rises in the neighborhood of Chiamdo in Tibet (its exact sources are not known); it pursues a generally S. direction to the China Sea, which it enters by several months in Cochin-China (which country is indeed formed by its deltaic deposits); total length 2,500 miles; but not navigable higher than lat. 14° N., owing to rapids and cliffs which beset its bed in the mountainous regions.
MEKRAN (mek-rän'), maritime Persia and of Baluchistan; it is mostly arid and barren, but there are fertile tracts along the river valleys yielding excellent dates.