Where in the World is Wiki?

This week!

I am standing at the deepest part of the world's oceans, and the lowest elevation of the surface of the Earth's crust, wouldn't that be something if it were even possible!
A clue: It is located in the western Pacific Ocean.

Where am I?

I am standing at the very top of the highest waterfall in the world.
My water actually drops 15 times further than the famous Niagara Falls in the USA.

What is my name? 

Please send me your answer on the Home Page or on my Fan Page on Facebook.