Vineland Island, sometimes called Vineland, is an island country oceanically bordering Mushroom Kittehlandia Territories near New Donk City.
It was founded by let's player Vinny, and it is home to his arch nemesis Vlinny as well as the third Mario brother Sponge.
map of it's location
The flag of Vineland
Vinny created it because he was forced to by an evil hive mind which stalks him called Chatyot, who later went on to create their own country.