The Salmon Falls River is a tributary of the Piscataqua River in the U.S. states of Maine and New Hampshire. It rises at Great East Lake, Newichawannock Canal, and Horn Pond and flows south-southeast for approximately 38 mi , forming the border between York County, Maine, and Strafford County, New Hampshire.
Can we infer the following?
The Piscataqua River is the largest in Maine. 

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