Sumer

SEQ NLI \r 0 \h ?? seq NL1 \r 0 \h Chapter 2 (second part of chapter 1 in textbook) - The First River-Valley Civilizations, 3500?1500 b.c.e. I?? seq NLA \r 0 \h . Mesopotamia A?? seq NL1 \r 0 \h . Settled Agriculture in an Unstable Landscape 1?? seq NL_a \r 0 \h . Mesopotamia is the alluvial plain area alongside and between the Tigris and Euphrates Rivers. The area is a difficult environment for agriculture because there is little rainfall, the rivers flood at the wrong time for grain agriculture, and the rivers change course unpredictably.