海流

1. Origins, structure, and basic meaning

• Structure: 海流, read かいりゅう, combines sea 海 with current 流 as the name of large-scale water movement.
• Basic usage: It denotes a large, continuing movement of seawater, as in 海流に沿う.

2. Common pitfalls and similar expressions

• Scope and context
  • Unlike temporary surface waves 波, it focuses on the movement direction of water across a broad sea area.