越境

1. Origins, structure, and basic meaning

• Structure: 越境 is read as えっきょう and functions as a noun or with する for movement across a national, administrative, or territorial boundary.
• Basic usage: Use 許可のない越境 for an unauthorized act and 野生動物の越境移動 for cross-boundary wildlife movement.

2. Common pitfalls and similar expressions

• Kinds of boundary
  • It can involve an international border, an administrative line, or another territorial boundary crossed by wildlife.
• Illegality comes from context
  • 越境 is not inherently unlawful; 許可のない is what explicitly makes the first crossing unauthorized.