Tetes Cave, Cave and waterfall in Sidomulyo, Lumajang Regency, Indonesia

Tetes Cave is a cave in Sidomulyo village, Pronojiwo district, Lumajang regency, East Java, formed where a waterfall drops over its entrance. Water seeps through the ceiling and falls as drops inside, and the walls hold stalactites and stalagmites. Visitors reach it on foot from the Tumpak Sewu parking area.

The cave formed over thousands of years as water interacted with limestone rock, gradually dissolving and shaping the passages. This natural geological process created the structure visitors explore today.

The name Tetes comes from the water dripping from the cave ceiling, fed by the waterfall above the cave. The cave was first found in 1969 by a woodcutter, and from 1975 it was visited mainly by scout groups from schools around Pronojiwo before the Lumajang regency government opened it as a tourist site in 1982.

The cave lies below Tumpak Sewu Waterfall and is reached through that site's entrance; from the parking area a steep path descends for about 30 minutes to the cave mouth. Facilities at the site include a mushola, toilets, photo spots, a camping area and parking. The cave is open daily from 07:00 to 17:00 WIB.

Inside the cave, an underground river system features water drops falling from ceiling formations onto the subterranean stream below. These falls create echoing sounds that reverberate through the chambers, producing a distinctly resonant acoustic experience.