Ogallala (High Plains) Aquifer — Boundary

Extent of the High Plains aquifer, also called the Ogallala — the largest aquifer in the United States, underlying parts of eight states from South Dakota to Texas. Unconsolidated sand and gravel. One polygon; useful as context beneath irrigation, well and water-level layers.

• water
• aquifer
• ogallala
• high-plains
• groundwater
• environment