全域

1. Origins, structure, and basic meaning

• Structure: 全域(ぜんいき) means the whole area within a specified scope.
• Basic usage: It is used for the area surveyed across an island or the extent of access to a building.

2. Common pitfalls and similar expressions

• What the whole area belongs to
  • 島の全域 means the entire area of the island.
  • 建物全域 means the entire building, with that building defining the scope.
• を marks the area traveled through
  • In 全域を歩いて, を marks the area walked through.