It could refer to:
* A specific bridge named after someone called Agatha. There are several bridges named after people, so it's possible this is a specific location.
* A bridge made of agate stone. This is less likely, as agate is a semi-precious stone and not commonly used for building materials.
To understand the meaning of "Ponte Agata" in your specific context, you would need more information, such as:
* Where did you see this phrase? Was it in a book, a travel brochure, a map, or a conversation?
* What is the context of the phrase? What was being discussed before or after it was mentioned?
With more information, I can help you decipher the meaning of "Ponte Agata" more accurately.