Just to chime in on this one, I think there is some great diving to be experienced throughout the Ozark and Ouachita regions. It's a shame that more people don't take advantage of opportunities to dive, and mostly it is due to the remoteness of suitable locations from a dive shop and compressor for tank fills.
Up in the mountains of Oklahoma and Arkansas, you can find a lot of rivers and creeks that are fun to explore, not to mention some impoundments with really clear water. I'm constantly amazed by the number of divers in Oklahoma who've never been to Broken Bow lake in the SE part of the state, for example, or to Lake Ouachita in Arkansas (. The rivers are a lot of fun to explore and float trips are a great way to do it. That means a canoe and a pair of tanks or hookah rig, as you'll be a good distance from dive shops.
People often tip canoes and kayaks or other boats below shoals or rapids and if you explore such holes, you may find everything from fishing gear and guns to jewelery. Take a fishing pole and enjoy fishing for largemouth bass, smallmouth bass, goggle-eyed perch, catfish and more as you travel between holes. If you're the kind of person that likes to float, camp, fish and dive altogether, it's a blast. If you ONLY want to dive and not lug tanks around or float in a boat or raft of some sort...you might not enjoy the rivers and streams as a dive destination.
That still leaves a lot of lakes, some small and some not so small, that you can dive. I enjoy diving through the Ozark, Ouachita and Kiamichi mountain ranges. Get yourself a pair of HP steel 120s or 130s and then rent another two or three for a few days and plan a route...or take a hookah rig for two and a partner. A 4 wheel drive and some camping gear will get you to some interesting places as well.
Just my two cents worth. Hope everyone has a great week.