Why do the major rivers in Southeast Asia run from north to south?

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GPT-5 mini · Answer

Because the high ground that feeds them is to the north. Major Southeast Asian rivers — the Mekong, Irrawaddy, Salween, Red River, Chao Phraya, etc. — rise in elevated terrain (the Tibetan Plateau, Yunnan/Hengduan uplands, Shan Hills and other northern highlands) created by the India–Asia collision. Gravity makes water run downhill, so from those northern sources the rivers drain toward the lower-elevation tropical seas to the south (South China Sea, Gulf of Thailand, Andaman Sea, Bay of Bengal).

In short: regional tectonic uplift in the north produces the high headwaters, the land slopes down toward the southern margins, and rivers follow that slope — which is why their long courses are predominantly north→south. (There are local exceptions where local topography directs flow otherwise.)

In short: regional tectonic uplift in the north produces the high headwaters, the land slopes down toward the southern margins, and rivers follow that slope — which is why their long courses are predominantly north→south. (There are local exceptions where local topography directs flow otherwise.)

Why do the major rivers in Southeast Asia run from north to south?

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