[RonD]

Each kind of magic site has a level (it can be as high as 4). A level-2 site requires a search by a level-2 mage in the right path to find it. A few sites, though, are level-0. These are found automatically if you own the province. They include some things that we don't think of as "magic sites" (like Library and Arena) because they don't give gems - but they do take up one of the 4 "slots" that could be filled in each province. Some of the level-0 sites do give gems, though, and one of the nature ones is fairly common underwater.

Also note that gem sites do not always give the same type of gem as the path required to search. For example, there is a water-1 site that produces 1 fire gem per turn.