What region is Treviso in?

Excuse me, but could you please clarify for me where exactly the city of Treviso is located? I'm trying to get a better understanding of its geographical position within the broader region. Is Treviso situated in a specific province, or is it more of a standalone city? Additionally, could you provide some insight into the surrounding regions and how they relate to Treviso? Your expertise in this matter would be greatly appreciated.