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Quick answer : That's a common myth we have Hollywood to thank for. Part of Texas is part of the desert southwest. You have to keep in mind the state is vast --El Paso is almost as close to Phoenix, Arizona as it is to Houston, I think-- and the terrain changes. Texas has seven eco-regions. TPWD Kids: Texas Regions I grew up in the Piney Woods region and now live in the Gulf Coast. Houston is large and has elements of both - roughly Piney Woods in the northern half and Gulf Coast in the southern half. Additionally, the western half of Texas isn't nearly as populated as the eastern half, so all those Hollywood movies depicting Texas as a vast desert wasteland are laughable at best, considering most Texans don't live in the western part of the state.
Only the SE third of AR is flat. The rest of the state is quite "mountainous."
The eastern third of Arkansas is flat, but only another third is the Ozarks. The other third in the southwest, is flat-to-rolling hills type stuff. I think they do a lot of logging down there.
Iowa (although I think Iowa is more gently rolling hills)
Yes, Southern Iowa does have rolling hills, and that continues into parts of Eastern Iowa. i-80 actually goes through a very hilly section of Iowa land.. but when you go North of 80, about 1/3rd of the state REALLY is flat. (I don't think this is a bad thing, I think it's pretty.)
Here is a pic just North of metro Des Moines.
This next one is in grundy county just west of Waterloo... more of the rolling hill look to it.
Put it this way. The states that, IMO, have the most flat areas are IL, TX, FL, KS, IN, LA, AL and OK. But even those states (minus FL) have very hilly areas. TX has mountains in far western portions and Hill Country. IL has the NW corner, portions of the central area and the southern 1/3rd of the state that are very hilly. KS has the Flint Hills and even mostly flat Oklahoma has several beautiful mountain ranges (yes, MOUNTAINS). Southern Indiana is also gorgeous, especially Brown County. Heck, even Alabama has some gorgeous mountains. But overall, most of those states are majority flat. Outside of Florida, I havent been to a single state that is entirely flat, that just doesnt happen. Even vaunted mountainous places like California and Colorado have flat, boring wastelands, too. Especially Colorado! Even Nevada and New Mexico have places that make Kansas seem mountainous! lol
No even then TX still isn't really considered a flat state. Many people think the hills/mountians are only confined to West Texas and Hill country, but you got hills in North Texas, Central Texas, and East Texas as well.
Pennsylvania is the least flat state I have ever been in, NY is second.
Parts of Nebraska is very flat (along I-80), but Omaha is quite hilly, especially the farther east you go in the city towards the MO. River. Even though the I-80 corridor is flat, the elevation goes up as you travel west. It was interesting to watch it on the GPS this last trip out. Omaha is about 1200 ft. Ogallala (sp?) is about 3300. So you are traveling imperceptibly UP.
Put it this way. The states that, IMO, have the most flat areas are IL, TX, FL, KS, IN, LA, AL and OK.
How does AL keep coming up. AL and GA have to be two of the hilliest places I've ever been in the south
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: That's a common myth we have Hollywood to thank for. Part of Texas is part of the desert southwest. You have to keep in mind the state is vast --El Paso is almost as close to Phoenix, Arizona as it is to Houston, I think-- and the terrain changes. Texas has seven eco-regions. 
