Location from Fourth Wing by Rebecca Yarros
The magical barriers protecting Navarre from the venin and their wyverns — ancient, powerful, and failing, sustained by wardstones that are being drained faster than they can be replenished.
The Wards are Navarre's greatest defense and its most dangerous secret. These magical barriers, powered by wardstones scattered across the kingdom, prevent venin and their corrupted wyverns from crossing into Navarre's territory. For generations, the Wards have held — but they are failing. Gaps appear and widen, wardstones lose power, and the venin probe relentlessly for weaknesses. Navarre's leadership knows this and has chosen to hide the deterioration rather than prepare the population. The Wards represent the central tension of the series: the difference between the safety people believe they have and the crisis that is already upon them.