This Opera by Giovanni Paisiello [9th May 1740 - 5th June 1816] was premiered in 1789. However there would seem to be no public database holding a synopsis in order to answer your question and the opera is totally outside the mainstream. I can only suggest that you try a music library to see if they hold a score and that should give you a synopsis of the story.
The population of Molinara is 1,907.
The area of Molinara is 24.1 square kilometers.
Opera a la Carte - UK - was created in 1993.
Opera a la Carte - US - was created in 1970.
La valley
La boheme
Puccini's opera 'La boheme'
La marquise de Brinvilliers - opera - was created in 1831.
Philadelphia La Scala Opera Company was created in 1925.
Philadelphia La Scala Opera Company ended in 1954.
Rent is a rock opera based on Giacomo Puccini's opera La bohème.
Can you describe what the opera is about - any of the character's names? There is no opera called "La Wally", and I am drawing a blank trying to imagine what opera you are getting at.