If you want to get geographical you have to configure in the Red River of the North which flows north unlike the Mississippi and it cuts the drainage basin short up north in the Minnesota/North Dakota area. Here is a link to show you a picture: http://toxics.usgs.gov/hypoxia/images/mississippi_river_watershed.gif The Rocky Mountains are in the west. They act as a barrier. The appalcian mountains in the east probably do as well.
the Appalachian mts and the rocky mountatins.
The Appalachiain Mountains to the east and the Rocky Mountains to the west.
Mississippi
The east was bounded by the Mississippi and the West ( andSouth) by the Missouri River.
Mississippi River & . . .
Mississippi
If you want to get geographical you have to configure in the Red River of the North which flows north unlike the Mississippi and it cuts the drainage basin short up north in the Minnesota/North Dakota area. Here is a link to show you a picture: http://toxics.usgs.gov/hypoxia/images/mississippi_river_watershed.gif The Rocky Mountains are in the west. They act as a barrier. The appalcian mountains in the east probably do as well.
Mountains, rivers, oceans, and deserts were natural features that served as boundaries between culture areas.
A natural boundary is formed with natural geographic features, such as mountain ranges and rivers. They often become political boundaries. However, political boundaries are boundaries between countries, and they do not really care about natural geographic features, like mountain ranges. They just draw out in the land by politicians.
Mississippi River and Rocky Mountains.
disaster
the Mississippi River and the Unaka Mountains, also known as the Appalachian Mountains or the Smokies
nile river
Watershed.