When I was in highschool I came to this place and all I see is a waterfall.
I went there just now, and what I see is an amazing waterfall, made up from lava and volcanic breccia with 90 metres tall.
We can see the vertical collumnar joint which indicate the horizontal flows.
Curug (sundanese language for waterfall) Cimahi is a waterfall from Ci Mahi (Ci in english means River, so Ci Mahi means River Mahi). This river come from Situ Lembang (Situ means Lake), Situ Lembang now become the training center of Kopassus, Indonesian Army.