Wikipedia's contents: Portals
Portals complement main topics in Wikipedia, and expound upon topics by introducing the reader to key articles, images, and categories that further describe the subject and its related topics. Portals also assist in helping editors to find related projects and things they can do to improve Wikipedia, and provide a unique way to navigate Wikipedia topics.
At present, there are 529 portals.
Recreation and entertainment
Provinces and States
Impact of human activity