| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | floodplain agriculture | Nile river region | Floodplain agriculture has been a staple of the economy and food supply in the Nile river region for thousands of years. | 1 |
| 2 | river transportation | Nile river region | The Nile river region relies on river transportation for agricultural irrigation and fishing. | 1 |