We don't have synonyms for tresa yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are tress, stresa and trest.
(N) :
The river Tresa leaves Lake Lugano at a point between Lavena Ponte Tresa in Italy and Ponte Tresa in Switzerland and flows into Lake Maggiore near Luino, a few hundred metres after joining the Margorabbia.
(N) :
The river Tresa leaves Lake Lugano at a point between Lavena Ponte Tresa in Italy and Ponte Tresa in Switzerland and flows into Lake Maggiore near Luino, a few hundred metres after joining the Margorabbia.