The Irrawaddy River or Ayeyarwady River is a river that flows from north to south through Burma (Myanmar). It is the country's largest river and most important commercial waterway. Originating from the confluence of the N'mai

N'Mai River

The N'Mai River or May Kha River is a river in northern Myanmar .The N'Mai, runs parallel to the Mali River, and has its source in the Himalaya glaciers of Northern Myanmar at about 28° north latitude. It is not navigable because of strong currents...

 and Mali

Mali River

The Mali River is a river that originates in northern Burma. It flows approximately 320 km, when it meets with the N'Mai River and forms the Ayeyarwady River. Construction of the Myitsone Dam has begun at this confluence....

 rivers, it flows relatively straight North-South before emptying through the Irrawaddy Delta

Irrawaddy Delta

The Irrawaddy Delta or Ayeyarwady Delta lies in the Ayeyarwady Region , the lowest expanse of land in Burma that fans out from the limit of tidal influence at Myan Aung to the Bay of Bengal and Andaman Sea, 290 km to the south at the mouth of the Ayeyarwady River...

 into the Andaman Sea

Andaman Sea

The Andaman Sea or Burma Sea is a body of water to the southeast of the Bay of Bengal, south of Burma, west of Thailand and east of the Andaman Islands, India; it is part of the Indian Ocean....

. Its drainage area of about 255,081 km² covers a large part of Burma.