湾口

1. Origins, structure, and basic meaning

• Structure: 湾口 is read as わんこう and is a noun for the entrance or mouth where a bay opens toward outer water.
• Basic usage: A lighthouse stands 湾口に, while a vessel passes through with 湾口を抜ける.

2. Common pitfalls and similar expressions

• Not the whole bay
  • 湾口 identifies the entrance portion and does not mean the entire bay or harbor.
• Location and route
  • に marks where the lighthouse stands, whereas を marks the route the vessel takes toward open water.