In this guide, biologist Mark Gustafson introduces residents and visitors to the history, geology, water resources, plants, and animals found in the nineteen counties occupying the eastern part of the Edwards Plateau, the heart of the Hill Country. He profiles three hundred of the most common and unique species from all of the major groups of plants and animals: trees, shrubs, wildflowers, cacti, vines, grasses, ferns, fungi, lichens, birds, mammals, reptiles, amphibians, fishes, and invertebrates. Color photographs are included for each species along with a brief description. He closes with a chapter on significant state parks and natural areas in the region as an invitation to visit and explore the Texas Hill Country. As large metropolitan areas continue to encroach on the Hill Country, newcomers are moving in and more people are flocking to its many attractions. This guidebook will enrich the appreciation of the region's rich and unique biodiversity and encourage conservation of the natural world encountered.