All of these rivers flow into the Arabian Sea, which is going to give the Indus River Valley Civilization access to that water, and eventually access to the Persian Gulf, which is access to Mesopotamia. They're going to be like friends and such. So now that you know the very basics about the geography of that area, let's look at the beginnings of the roots of the Indus River Valley Civilization. Here we go. So let's start with the big picture, which is I really don't know the big picture, because the Harappan civilization doesn't have a writing system that we have figured out to be able to read yet. It's undeciphered. There is no Rosetta Stone.