Great Waterfall
The Great Waterfall is the highest waterfall in the Land of Oz, over which the Scarecrow accidentally fell.
First named in The Scarecrow of Oz, ch. 22
"You see," said the Scarecrow, leaning over the brink, "this is called by our Oz people the Great Waterfall, because it is certainly the highest one in all the land; but I think--Help!"
Where this is
placed In Oz worked out
read out of the chapters cited on this page, not stated in any one sentence of them
The Scarecrow calls it what 'our Oz people' name the highest waterfall in the land (Scarecrow of Oz ch.22).
What the books say it is
appearance a sheet of silver dropping far down into a tiny lake 1 chapter
a sheet of silver dropping far, far down into a tiny lake which seemed to have no outlet.
The Scarecrow of Oz, ch. 22