Tumpak Sewu Waterfalls 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, which flows down Semeru, is the primary water source for the...