Moria Gate

It's weird to see the word "Moria" on a part of the stones, when Tolkien himself made a frame containing the name. Anyway, it is like it is.
The Moria gate is the entry used by Frodo and the others to pass through the mountains. For the usage of the drawing, Tolkien made the door obvious.
If you look carefully the water, a tentacle is outside the water.
But what is weird is the fact there is a waterfall and a running water when Tolkien made the river dry because of a "dam" to create the lake.