城内

1. Origins, structure, and basic meaning

• Structure: The written form is 城内, read じょうない. Elements for castle and interior combine to denote the area within a castle or its grounds.
• Basic usage: 城内に集まる marks the place where people gather, while 城内を巡回する marks the area traversed by a patrolling soldier.

2. Common pitfalls and similar expressions

• A gathering inside the castle
  • On the festival day, the castle interior serves as the gathering place. Example: 祭りの日は城内に多くの人が集まりました。 — Many people gathered inside the castle on the festival day.
• An overnight patrol area
  • The castle grounds form the route patrolled throughout the night. Example: 物語の兵士は夜通し城内を巡回します。 — The soldier in the story patrols the castle grounds throughout the night.