I think the OOlu Ella or Lotus Waterfall is near Yatiyantota and to reach it one has to travel through Poonagala on the Nawalapitiya Road to Amanawala. It is the fifth highest in Sri Lanka, and is about 127 meters in height.

That is absolutely correct ! And after the rains, it also one of the most beautiful waterfalls too.

It is situated in Malapola, Yatiyantota. The main road of Awissawella, Nuwaraelliya