Tarpianjoki, sometimes also Viialanjoki, is a river in Pirkanmaa, Finland.
WSOY Iso tietosanakirja 10, page. 245, WSOY 1997 ISBN 951-0-20163-4
61°11′35″N 23°46′00″E / 61.19296°N 23.766566°E / 61.19296; 23.766566