港内

1. Origins, structure, and basic meaning

• Structure: 港内 (こうない) is a noun for the area or waters inside a harbor.
• Basic usage: It describes a vessel entering the harbor at reduced speed or navigating harbor waters in fog.
  • 小型船は速度を落として港内へ入った。 — The small vessel slowed as it entered the harbor.
  • 濃い霧のため、港内の航行には注意が必要だった。 — Dense fog required caution while navigating harbor waters.

2. Common pitfalls and similar expressions

• Destination and navigation area
  • In 港内へ入る, the harbor interior is the destination, while 港内の航行 identifies it as the area in which navigation occurs.