Tumpak Sewu, also known as Coban Sewu, is a waterfall in East Java, Indonesia, located between the Pronojiwo District in the Lumajang Regency and the Ampelgading District in the Malang Regency. Semeru, Java’s highest mountain and an active volcano, obscures the waterfall. The waterfall’s primary water source is the Glidik River, which flows down Semeru. Tumpak Sewu roughly translates to “a thousand waterfalls” in Javanese. The name most likely refers to the appearance of multiple waterfalls in a single, semicircular area.
Tumpak Sewu is a popular weekend destination for tourists. Although the construction of infrastructure around and within the main box canyon has made it easier to access the area, the journey to enter or exit is still physically demanding and can take up to an hour.