Where did Paul write the book of Revelation?

It appears that the Book of Revelation was written by someone called John, while on the Island of Patmos (Revelation 1:1,9). It was written neither by Paul nor by the apostle John.

The apostle Paul did not write the book of the Revelation.

The apostle John, one of the original 12 disciples, wrote this book while exiled on the Isle of Patmos.

Answer

The island of Patmos is very close to the church of Ephesus which John pastored and to which he delivered Revelation after he wrote it.

CLARIFICATION: there is no evidence that the apostle John wrote the Gospel of John. In fact there is plenty of evidence that ALL four Gospels of the Bible, Mathew, Mark, Luke and John were written by people not connected with the original 12 and who had never met Jesus.