Other Side of the Waterfall (滝のむこうがわ, Taki no Mukougawa) is an event in Tomba! 2: The Evil Swine Return.
Find out what is behind the waterfall.
When you have come to Win's Windmill at the Waterfall of the Heavens, jump onto the roof of the windmill to activate a cutscene and the event. This event will be cleared very later in the game.
When you have reached the Water Temple and gained access to the Minitta Machine, you can clear the event. From the Minitta Machine, jump up to a higher level and climb up the platform in the middle of the waterfall. Walk though the door inside the waterfall and you'll come into a room. The event is cleared.