El Desert Land
From the Super Mario Wiki
El Desert Land is a desert in The Super Mario Bros. Super Show! episode "The Mark of Zero". This desert also has a small town with Mushrooms as the citizens. Outside town, there is a mexican food restaurant. The town and desert's hero is Zero and she is a very mysterious person to the citizens of El Desert Land - she was even thought to be a male at first.
El Desert Land was attacked by El Koopitan in the episode. El Desert Land looks like an old Mexican town. Coincidentally, a few months later Super Mario Bros. 3 was released and that game had a world called Desert Land. This world's name was very similar to "El Desert Land".