Envision a fantasy world map delicately illustrated on vellum. Central to this map is a gigantic continent known as The Sovereign Lands. In the very heart of this landmass lies a vast plain, bisected by a powerful river that provides life to a central, invisible city, a place of legend and lore. The continent itself is a testament to diversity, with each corner offering new terrains such as icy tundras, arid deserts, and lush rainforests. This map is a silent guardian of secrets, presented without any inscriptions or markers, allowing the imagination to roam free.