BINGO!!! I'm watching Angel Falls fall over the edge right now...falling away deep into the abyss and turning into a misty spray before it hits the bottom.
Actually, I was first thinking of those flat top plateaus in Venezuela called tepui, and Angel Falls falls from the top of one called Auyantepui.
A Tepui (or Tepuy) is a table-top mountain (mesa) found only in the Guayana highlands of South America, especially in Venezuela. The word tepui means "house of the gods" in the native tongue of the Pemon, the indigenous people who inhabit the Gran Sabana. Tepuis tend to be found as isolated entities rather than in connected ranges, which makes them the host of a unique array of endemic plant and animal species. Some of the most outstanding tepuis are Autana, Auyantepui and Mount Roraima (the highest and most famous one, on the border tripoint of Venezuela, Brazil and Guyana). They are typically composed of sheer blocks of Precambrian sandstone or quartzite rocks rising abruptly from the jungle, giving rise to spectacular natural scenery. Auyantepui is the source of Angel Falls, the world's tallest waterfall.
PS: strangely enough, my cousins grew up in Venezuela. Strange because we're all born in Austria and Hungary, but when we came to the U.S. they couldn't get in due to "quota" limits so they chose South America and other cousins chose Canada. So when we get together we're all blabbing in tongues...Hungarian, German, Czech, ...and my weird cousins in Spanish.