Treppoja Cascade is located by Tallinn-Paldiski Road in Keila Rural Municipality, Harju County. The cascade is situated at a place where the catchment area of Treppoja, that is approx. 10 km in length and 20 km2 large, begins from Illurma klint cape and then slides down through the slope of the limestone plateau into the Lahepere klint bay. There are six 0.3–1.5 m high escarpments (the overall height difference is approx. 5.5 m) within one hundred meters on this 2–15 m wide territory. The cascade has not been able to form a canyon because of the lack of water and its young age. Visiting it in summer or winter does not make a big difference because it will never be too late to go there.