Mewni is a fictional kingdom from the animated television series Star vs. the Forces of Evil. It is known for its magical landscapes, diverse inhabitants, and rich history. The kingdom is ruled by the Mewman royal family, which includes characters like Star Butterfly and her parents, King River and Queen Moon. The culture of Mewni is heavily influenced by magic, with various spells and creatures present throughout the land. The kingdom is also home to different species, including Mewmans and Monsters, and features unique locations such as the Royal Castle and the Magic High Commission.