Kansas - and that is the Over the Rainbow Bridge at the top Kansas

AustinPowers did the most boring area of the map – Kansas. The two main attractions are the monorail cycle ride named Almira Gulch Dognappers, and the wooden, The Kansas Twister. Then, over the rainbow bridge, is Munchkin Land.
We wish to welcome you to Munchkin Land... Munchkin Land

Ello did this colorful area. The main attractions are a Virginia reel named Munchkin Folkdance Fest Contest, a hedge maze named Munchkin Garden Maze, and the Matchmaker Mansion, a haunted mansion ride. Check out the dead witch under the crooked house too.
If I only had a brain... Scarecrow

Metropole tackled this area. His main attractions are a mini roller coaster named The Scarecrow Formula, and a wooden wild mine ride named Brainteaser.

Oil Can...  I think he said "Oil Can".

Tin Man

Penguin_BOB had a lot of fun with this area. Check out his Top Thrill Dragster-like Hyper Twister, named Whole-Heartedly. Other attractions include: a hedge maze named Lions & Tigers & Bears Oh My! , and a vintage car ride named Tin POS.