Surah 20:53
"(It is He) who made the earth as a cradle for you, and put (path)ways in it for you, and sent down water from the sky. And by means of it We brought forth pairs of various (kinds of) vegetation."
The Earth is Flat
The Qur'an tells all Muslims to face in the direction of Mecca when they pray. However, this would only be possible on a flat Earth because it is not possible to bow down towards the direction of Mecca when you are on the opposite side of the earth. The author here presupposes a small world, local to Arabia, that is flat. Only in that world view can people everywhere face Mecca.