Where was Daniel imprisoned in the bible?

There are more than one Daniel in The Bible, but the name 'Daniel' is almost always associated with the Book of Daniel, which describes Daniel as a young boy when taken into exile by the Babylonians. He would have been born shortly before 600 BCE. No other book in the Old Testament mentions this Daniel, although Ezekiel does mention a near-contemporary also called Daniel. However, Ezekiel's Daniel must have been a little earlier that the hero of the Book of Daniel.

The Book of Daniel speaks of Daniel in the third person, thus the author was not Daniel himself. In fact, there is good reason to doubt whether Daniel was a real, historical person. The book appears to have been written approximately 147 BCE to describe events occurring hundreds of years earlier, and its hero might have been inspired by the Daniel in the Book of Ezekiel. Historical errors in the Book of Daniel make its evidence unreliable.