Why is the wettest place in Eurasia not in the equatorial but in the sub-equatorial zone?

The equatorial zone in Eurasia includes only the southern end of the Malay Peninsula, as well as some coastal islands. Since these territories are plains, precipitation spreads over them evenly. In the subequatorial zone, the amount of precipitation depends on the monsoon winds. The monsoon that blows from the ocean onto land brings with it a tremendous amount of moisture. When wet clouds reach the southern foothills of the Himalayas, they can no longer move north, and therefore much more precipitation is poured there than in the equatorial zone.