海抜|かいばつkaibatsu[0]heiban (flat)

1. nounheight above sea level
   エヴェレスト山やまは海抜かいばつ29,002フィートです。↗

   Mt. Everest is 29,002 feet above sea level.

• Synonym標高ひょうこうNeutralAlso height measured from average sea level; mostly interchangeable with 「海抜」, but 「標高」 is the usual choice in descriptions of mountains and locations.
• Related高さたかさNeutralThe general word for height of any kind — objects, a person's stature, levels. 「海抜」 is limited to height measured from average sea level and can't be used this broadly.
• Antonym水深すいしんNeutralDepth of water, measured straight down from the surface to the bottom — the opposite direction from 「海抜」, which measures up from sea level.

For height above sea level, use 「海抜」 or 「標高」 — mostly interchangeable, though 「標高」 is more common in mountain and location descriptions, and fixed phrases like 「海抜0メートル地帯」 take 「海抜」. For height in general, use 「高さ」; 「水深」 measures downward instead.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 平均へいきん海かい水面すいめんを基準きじゅんとした高たかさ。