Where is the Texas Hill Country? The Texas Hill Country is a region in Central Texas known nationally for its spectacular natural settings. Its boundary, however, is perceptual and varies according to the source. One thing everyone seems to agree on is that the region lies within a greater region known as the Edwards Plateau which is the only ecological region contained in one state. The hills of the Hill Country are actually huge limestone deposits left over from millions of years of erosion of surrounding sediments.