Meaning
Whether you are looking at a map of Japan or planning a summer trip, you will see the character 海 everywhere. Japan is an island nation, so the sea is central to its food, history, and daily life. This Grade 2 kanji appears on the N4 level of the JLPT. It is a fundamental character for anyone moving beyond the most basic level of Japanese study.
Structurally, 海 is a phono-semantic compound. The left side features the sanzui radical (氵), which represents water. This radical appears in almost every kanji related to liquids. The right side, 每 (mai), is often interpreted as containing the kanji for mother (母). This creates a poetic image: the sea as the mother of all life. In daily use, this kanji refers to the physical ocean and appears in many terms related to international affairs and foreign travel.
Readings
On'yomi (音読み) — カイ
The reading カイ (kai) is used in compound words (jukugo). Since Japan is surrounded by water, you will find this reading in many geographic and maritime terms.
海外 (kaigai) — Overseas or foreign countries (literally "outside the sea")
北海道 (hokkaidou) — Hokkaido, Japan's northernmost main island
海水 (kaisui) — Seawater
Kun'yomi (訓読み) — うみ
The native reading うみ (umi) is used when the kanji stands alone as a noun. It is the word people use when talking about going to the beach or describing the water's color.
海 (umi) — Sea / ocean
海辺 (umibe) — Seaside / beach / shore
海鳥 (umidori) — Seabird or seagull
Common Words & Compounds
This kanji is incredibly versatile. Here are some common ways you will encounter it in daily life:
Nature & Geography
海岸 (kaigan) — Coast or seashore
海底 (kaitei) — Ocean floor
深海 (shinkai) — The deep sea
地中海 (chichuukai) — The Mediterranean Sea
Daily Life & Food
海鮮 (kaisen) — Fresh seafood, often seen on restaurant menus
海苔 (nori) — Dried seaweed used for sushi
海水浴 (kaisuiyoku) — Ocean swimming or sea bathing
海賊 (kaizoku) — Pirate (literally "sea thief")
Example Sentences
夏休みに家族と海へ行きました。
natsuyasumi ni kazoku to umi e ikimashita.
I went to the sea with my family during summer vacation.
この町の海鮮料理はとても有名です。
kono machi no kaisen ryouri wa totemo yuumei desu.
The seafood dishes in this town are very famous.
来年は海外で働きたいです。
rainen wa kaigai de hatarakitai desu.
I want to work overseas next year.
海岸をゆっくり散歩しました。
kaigan o yukkuri sanpo shimashita.
I took a relaxing walk along the coast.
海の底にはきれいで珍しい魚がいます。
umi no soko ni wa kirei de mezurashii sakana ga imasu.
There are beautiful and rare fish at the bottom of the sea.
Related Kanji
- 地 — Ground, Earth, Land (Kanji N4)
- 野 — Field, Plain, Wild (Kanji N4)
- 田 — Rice Field (Kanji N4)
- 春 — Spring (Kanji N4)
- 界 — World, Boundary, Circle (Kanji N4)
- 菜 — Vegetable, Greens, Dish (Kanji N4)
Memory Tip
Focus on the components: Water (氵) and Mother (母). Think of the phrase: "Water is the mother of the sea." Since all life is said to have originated in the ocean, this connection helps you remember why the radical and the right side are paired together. Another trick: you can see "Every" (毎) on the right. Imagine that "Every" drop of water eventually finds its way back to the sea.