Trein d'Ustou
French
Etymology
Attested on the
Cassini map
(1740s).
Proper noun
Trein
d'
Ustou
m
former name of
Trein
(
village in
Ustou
,
Ariège
)
Further reading
Cassini map
on
Géoportail
,
Institut national de l'information géographique et forestière
, 2019