Dot and Tot of Merryland by L. Frank Baum

Soft strains of sweet and soothing music fell upon the ears of the children as the boat glided silently through the arch that led into the Third Valley. Then the jagged rocks surrounding them melted away in the rear, and they passed into a country that lay peaceful and smiling under the pleasant rays of the sun.

At first, Dot thought the entire Valley was carpeted with soft, white plush, but afterward she found it was a silken moss which grew thickly everywhere. There were a few trees, with wide-spreading branches, and upon these grew beautiful flowers that filled the air with delicate perfume, but in most places the Valley, which was shaped like a great cup with gently sloping sides, was open to the warm rays of summer sunshine which flooded it.