The duel spirit realm that Duela visits is based on her deck's field spell, Skyscraper. It's shown that its like most metropolises, with shopping, taxis, ect. It also has a distant forest, where Eatos has a citedel.
Neo Space is a distant part of this region, homeworld to Jaden's Neospacians. Ancient Fairy Dragon's region is not part of this spirit world