水深

1. Origins, structure, and basic meaning

• Structure: 水深 is read as すいしん and is a noun for water depth from the surface to the bottom.
• Basic usage: Measuring a pond's depth appears in 池の水深を測る, while a bay's depth being shown numerically appears in 湾内の水深が数字で示される.

2. Common pitfalls and similar expressions

• Measured object and displayed subject
  • Use を測る when directly measuring the depth and が示される when it is displayed on a map.
• Difference from 深さ
  • Unlike the broad word for the depth of a hole, container, or other object, this term is limited to the depth of water.