Keith County, Nebraska is located over the 174000 sq mi water area. This area supplies water the the Texas High Plains AVA.
Ogallala is a city in Keith County, Nebraska, United States. 
The Ogallala Aquifer is a shallow water table aquifer surrounded by sand, silt, clay and gravel located beneath the Great Plains in the United States. 
 The Texas plains can be extremely dry, so most vineyards are irrigated with water from the Ogallala Aquifer. 
