The Sanjak of Biga was a second-level Ottoman province (sanjak or liva), roughly corresponding to the modern Çanakkale Province of Turkey.
The area of the sanjak was conquered from the Byzantine Empire by 1363, and with the establishment of the Anatolia Eyalet became part of it.
The governor's seat was not at Biga, however, but at Kale-i Sultaniye.
[4] After the latter's dissolution, Biga became an independent sanjak, roughly equivalent to the modern Çanakkale Province,[5] except for the Gallipoli peninsula, which was a separate sanjak.
[6] In the last decades of the Ottoman Empire, it was often called after its capital as Kale-i Sultaniye (modern Çanakkale).