The Big Salmon River is a small river in southern New Brunswick, Canada, that flows south into the Bay of Fundy. The river has its source to the southwest of Sussex, New Brunswick. The river flows into the Bay of Fundy near St. Martins, New Brunswick, and serves as the endpoint of the Fundy Trail.
Can we infer the following?
The Big Salmon River is the smallest river in southern New Brunswick.

Select from the following.
[+] Yes.
[+] It's impossible to say.
[+] No.
The answer is:
It's impossible to say