Ocean, Sea
noun
The kanji and the word are exactly the same. That means they share meanings as well.
うみ
Since this word is made up of a single kanji, it should use the kun'yomi reading. When learning the kanji, you didn't learn that reading, so here's a mnemonic to help you with this word: You visit the sea. Strangely, it asks you who is visiting. You're so full of yourself (even in front of the sea/ocean) that you reply: "um, me?" (うみ). Imagine yourself feeling this full of yourself.
その海の色はエメラルドグリーンでした。
The color of the sea was emerald green.
夏休みに友人たちと海に行く予定です。
I plan to go to the sea with my friends during the summer vacation.
いつか、海の近くに住みたいなぁ。
Someday, I want to live near the sea.
ワニカニは海の生物なのでしょうか？川の生物なのでしょうか？
Is WaniKani a sea creature? Is it a river creature?