Southeast Asia is a tropical monsoon, but the because of the vast geographical. So it does not have the same air region. Characteristics of precipitation caused by the monsoon that blows from the sea. Southeast Asia is a region that is suitable for cultivation, but it is not abundant in every district, depending on whether the area is in each field. There are rivers or not. The area where the fertile Red River area. The Chao Phraya River. The Ayeyarwady River (Irrawaddy River) Section of river Mekong, SA vs. Turbulent flow of water so it is not suitable for cultivation, so much.