Transylvania is a part of the country of Romania, which is a part of Europe. That is the general answer a person can give to people who want to know where Transylvania is found geographically in the world. A lot of the time this is a great answer and gives most people a reference point for the area.
There are many places to see in Transylvania, and maps are a great thing, especially if you want to write or publish a book (I have published one called In Search of The Lost Ones) I found that I had to spend a lot of time learning not only where to find Transylvania itself, but also where to search for the more important information you will need on Transylvania and books, this was an important part of my research. Travel books are wonderful, but they showed me only half of what I need to learn. I had to rely on a bit of oral history, but I also needed to go back to many older sources on the history of Romania and Hungary.
One of the best ways to learn about the history of Transylvania, beyond seeing the land and the people, is to look at both old and new maps. Transylvania changed politically many times, and using maps to find information is vital. By using older maps, I can also learn a lot of the history in the area.
Maps and books only show a part of what a person should know about this land and the people who live in it. Where is Transylvania? Geographically, the answer is simple, but historically the answer is harder to define.