Thonolan IV is the fourth planet in the Thonolan system. It is home to a large Andorian colony, and is run by an "Administrator".

During the 2360s, Thonolan colony was run by Administrator Thuvat.

The Andorian Ambassador to the Federation, Thev, and his blind daughter Thala lived on the planet until the mid-2360s. Thev was being transported to another planet by the USS Enterprise-D when it was catapulted 8,000 light-years away by Q. When the Borg sliced a piece of hull out of the Enterprise, Thev was killed and Thala was orphaned. (TNG episode: "Q Who?")

Dr. Selar, a Vulcan medical practitioner aboard the Enterprise, adopted Thala, as disabilities were frowned upon in the Andorian culture. (TNG novel: The Eyes of the Beholders)

Community content is available under CC-BY-SA unless otherwise noted.