Anne Jefferson's WoGE#291 highlighted a portion of Rio Xingu in Brazil threatened by the Belo Monte hydroelectric dam system to be built on this river. Being the first to provide the right answer to Anne's challenge entitles me to come up with the next puzzle, so here we go. Be the first to locate this view (give lat/long), describe it briefly in geological terms, and you instantly earn the privilege to host the next turn of the game.
I suspect that fieldwork or vacation keeps some of the WoGE enthusiasts away from the internet and therefore, to prevent the game from stalling, I'll declare this run restriction free. - pluffi