The phrase "last stronghold" refers to the final place or position that holds strong against opposition or control. It is the last remaining area or group that has not been conquered or overcome. Full definition
The second American Revolution has been crushed by the KPA occupation forces, and Philadelphia - last stronghold of the Resistance - is about to fall. (shortpause.com)
The project's vision is to safeguard the angelshark's last stronghold in the Canaries, stabilize the population and eventually increase angelshark numbers. (discovermagazine.com)
Reality shows are one of humankind's last strongholds against the invading forces of quality television. (myintimcity.com)