sustained the high population densities of Java and Bali. [76] Lying along the equator, Indonesia has a  tropical climate , with two distinct  monsoonal   wet  and  dry  seasons. Average annual rainfall in the lowlands varies from 1,780–3,175 millimeters (70–125 in), and up to 6,100 millimeters (240 in) in mountainous regions. Mountainous areas—particularly in the