Mount Wayang has a 750 m (2,500 ft) wide crescentic crater which holds four groups of fumaroles.

[1] The Wayang-Windu mountain complex is part of the hydrological divide that separates two major river basin groups in Java, dividing the northern and southern regions.

This hydrological boundary stretches from the east to the west of the Java Island.

The eastern slopes of the Wayang-Windu mountains are part of the Citarum River basin system, where the tributaries originating from these mountain slopes merge with the main river flow, eventually flowing towards the northern coast of Java and discharging into the Java Sea.

On the other hand, the western slopes are part of the Cilaki River basin system, where the tributaries from these mountain slopes join the main river and flow towards the southern coast of Java, ultimately reaching the Indian Ocean.