海底

1. Origins, structure, and basic meaning

• Structure: 海底 is read as かいてい and is a noun for the seabed or ocean floor.
• Basic usage: Terrain appears in 海底の地形, while location appears in 海底に眠る.

2. Common pitfalls and similar expressions

• Water and bottom
  • It denotes the bottom surface of the sea, not the entire volume of water below the surface.
• Difference from 海中
  • 海中 is the space within the seawater, while 海底 is the seabed beneath it.