Citation Hunt

The Wikipedia snippet below is not backed by a reliable source. Can you find one?

Click I got this! to go to Wikipedia and fix the snippet, or Next! to see another one. Good luck!

In page Bayonne:

"

The Treaty of Bayonne was concluded on 2 December 1856. It overcame the disputes in fixing the Franco-Spanish border in the area extending from the mouth of the Bidassoa to the border between Navarre and Aragon.[citation needed]