Definition of tarns:
(n) :
(Northern England) A small mountain lake, especially in Northern England.
(n) :
(US, chiefly Montana) One of many small mountain lakes or ponds.
(n) :
A right tributary of the Garonne in southwestern France, flowing through the departments of Lozère, Aveyron, Tarn, Haute-Garonne and Tarn-et-Garonne.
(n) :
A department of Occitania, France. Capital and largest city: Albi (INSEE code 81).