Tumpak Sewu, also known as Coban Sewu, is a tiered waterfall that is located between the Pronojiwo District, Lumajang Regency, and the Ampelgading District, Malang Regency, in East Java, Indonesia. The waterfall is overshadowed by Semeru, an active volcano and the highest mountain in Java. The Glidik River is a meltwater source fed from the mountain, which is the primary flow for the waterfall. Tumpak Sewu is loosely translated to mean a thousand waterfalls in the Javanese language. The name likely originated due to its appearance of many different waterfalls in one single, semi-circular area.