Deepest
The Deepest
noun, の adjective
The most deep is the deepest.
最深 is a formal word used in geology to describe the deepest point of things like caves and oceans.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
最深部
deepest part
最深点
deepest point
最深３００ｍ
300 meters at its deepest
水深は最深で３００mもある。
The depth of the water is 300 meters at its deepest point.
死の火山では、どうくつの最深部を目指します。
In the Volcano of Death, we will head to the deepest part of the cave.
ソグネフィヨルドは、世界最長・最深のフィヨルドです。
Sognefjord is the longest and deepest fjord in the world.