火口湖

1. Origins, structure, and basic meaning

• Structure: 火口湖 is read as かこうこ and means “crater lake”.
• Basic usage: It denotes a blue crater lake seen from an overlook and the restricted area around it.

2. Common pitfalls and similar expressions

• 火口湖を眺める / 火口湖の周辺
  • It is a lake formed in a volcanic crater. Use 火口湖を眺める for the view and 火口湖の周辺 for its surrounding area.