Tretes waterfall is the tallest waterfall in East Java, he two flows of water falls beautifully 158 meters downward. Located at the altitude 1250 meters in the area of Raden Soeryo Forest Park. The Park is conserved well, and it is the source of water supply of the area.

The waterfall is located about 4o km from Jombang city. It can be reached from Jombang Regency area, and should be followed by 5 km trekking. It can also be accessed from Kediri Regency area, Kandangan district heading to Gelendewo, and trekking about 1 km from parking area.

This waterfall is still natural that there is no tourism management undertaken in the area.