I purchased my first Delorme atlas and gazetteer several years ago when I was planning to spend time exploring parts of the Upper Peninsula of Michigan. I was so well pleased with the detail and how with its aid I was able to navigate the area that I decided to get one of these atlases whenever I was going to spend time in a state. So, when I headed to Arizona to combine a visit with my daughter in the Phoenix area with a trip to the area around the Grand Canyon I made sure I had a gazetteer with me. Like the others I have, this one proved invaluable. I was able to discover backroads that aren't shown on the typical roadmap. Plus, I was able to locate hiking trails and trailheads, thus allowing me to fulfill another passion while on my visit. I'm especially grateful that this is a topographical map, since it gives me a better idea of what sort of terrain I'll be encountering, whether I'm driving or on foot. I consider this to be an essential tool for serious exploration of an area.