Internally, the insular character of the Indonesian archipelago also causes great variation stemming from climate and volcanic activities. These factors greatly influence human habitation and cultural development. The islands situated near the equator, such as Sumatra, Kalimantan and Papua, have abundant rainfall throughout the year, whereas those in the south-east of the Archipelago have less rainfall and a longer dry season. The climate in the south-eastern part is similar to that of Australia. Since Java has a favorable climate for vegetation and a fertile-volcanic soil, it is not surprising that Java’s economy has benefited historically from such geographical advantages.