Just kind of the area of the world that archaeologists and historians are going to be able to refer to so we know what we're talking about. But a lot of different civilizations and city states, which we're going to talk about, are going to develop in this area because of geography. Geography is muy, muy importante because really you're dealing in the Middle East with a lot of sand and it's a hot sun and you can get real thirsty. But luckily there are two rivers, count them, two rivers that flow through this Crescent Valley and as you can see from the map, it looks like a crescent. We're stretching from the Mediterranean Sea in the west across the Middle East in that crescent shape until you get to the Persian Gulf. And the two rivers that flow southeastward across that desert sand are the Tigris and the Euphrates. Maybe you should write that down.