Generate a highly detailed fantasy map featuring diverse terrains and regions. Include a variety of landscapes such as lush green forests, expansive deserts, towering mountain ranges, rolling plains, coastal regions, and islands. Each region should be distinct with a specific color scheme: green for forests, yellow and beige for deserts, blue for water bodies (rivers, lakes, and seas), brown for mountains, and purple for mysterious lands. Add natural features like rivers flowing through the land, mountain peaks with snow caps, dense forests, and smaller islands off the coast. Incorporate subtle details like valleys, plateaus, and lowlands, along with small settlements, castles, and ancient ruins to create an inhabited and realistic feel. The style should be an old, weathered, and realistic cartographic map, resembling an ancient treasure map, but ensure there are absolutely no names, labels, or text on any of the regions.