Study the topographic map and symbol chart.

A topographic map with 4 regions labeled. The symbol chart shows a light green square with darker green shrublike icons representing swampland. A single black line with two hashes represents railroad tracks. Region 1 is a light green area with darker green shrublike icons. Region 2 is a green area with several contour lines. Region 3 is a green area with several contour lines. Region 4 is a flat green area near the Colorado River.

At which point is swampland located?

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