湾内

1. Origins, structure, and basic meaning

• Structure: In 湾内 (わんない), bay 湾 and inside 内 combine to denote waters within a bay.
• Basic usage: 湾内 denotes waters inside a bay enclosed by land, not the sea as a whole.

2. Common pitfalls and similar expressions

• Inside the bay
  • 湾内で marks the location of an action, while 湾内の links it to vessels, water quality, or another noun.