Table:
text: List of United States district and territorial courts
Active courts
Active courts
Region Citation Court_of_Appeals Established Judges Meeting_places Chief_judge
District of Rhode Island D.R.I. 1st 1790 3 1 Mary M. Lisi
District of South Carolina D.S.C. 4th 1789 10 11 Terry L. Wooten
District of South Dakota D.S.D. 8th 1889 3 5 Jeffrey L. Viken
Eastern District of Tennessee E.D. Tenn. 6th 1797 5 4 Thomas A. Varlan
Middle District of Tennessee M.D. Tenn. 6th 1839 4 3 William Joseph Haynes, Jr.
Western District of Tennessee W.D. Tenn. 6th 1797 5 3 J. Daniel Breen
Eastern District of Texas E.D. Tex. 5th 1845 8 7 Leonard Davis
Northern District of Texas N.D. Tex. 5th 1879 12 7 Sidney A. Fitzwater

Question: From the list of United States District and Territorial Courts, if the Chief Justice is Jeffrey L. Viken, what region is that?