Translation guide
A reef is a ridge of rock, coral, or sand near the surface of the sea. In Japanese, the most common word is 礁 (しょう), often used in compounds. For coral reefs, サンゴ礁 is standard. When referring to a reef as a navigational hazard, 暗礁 (あんしょう) is used. In sailing contexts, reefing a sail is 縮帆 (しゅくはん) or more casually リーフする.
A ridge of coral near the surface of the sea, often associated with tropical waters.
The standard term for a coral reef. Used in both everyday and scientific contexts.
沖縄のサンゴ礁は美しい。
The coral reefs of Okinawa are beautiful.
サンゴ礁の生態系を守らなければならない。
We must protect the coral reef ecosystem.
Kanji form of サンゴ礁. More common in written or formal contexts, but サンゴ礁 is generally preferred.
珊瑚礁の保護活動に参加した。
I participated in a coral reef conservation activity.
A ridge of rock or sand near the surface, often a hazard to ships.
General term for a reef, often used in compounds. By itself, it can refer to any submerged rock or ridge.
船が礁に乗り上げた。
The ship ran aground on a reef.
A hidden reef or sunken rock, especially dangerous for navigation. Often used metaphorically for hidden obstacles.
A rocky reef. Emphasizes the rock composition.
A hidden danger or obstacle, often used figuratively.
Idiom meaning to hit a snag or encounter an unexpected obstacle. Literally 'to run aground on a hidden reef'.
交渉は暗礁に乗り上げた。
The negotiations hit a deadlock.
To reduce the area of a sail by folding or rolling part of it, typically in strong winds.
The technical term for reefing a sail. Used in sailing contexts.
風が強くなったので、縮帆した。
The wind picked up, so we reefed the sails.
Loanword from English 'reef', used casually among sailors for reefing.
セールをリーフしよう。
Let's reef the sail.
礁 is the broadest term for any reef. サンゴ礁 specifically means coral reef. 暗礁 is a hidden reef, often used metaphorically. Use サンゴ礁 for tropical coral reefs, 礁 for general rocky reefs, and 暗礁 for navigational hazards or figurative obstacles.
The knot called 'reef knot' in English is 本結び (ほんむすび) in Japanese, not related to the reef concept.
この海域には暗礁が多い。
There are many hidden reefs in these waters.
計画は暗礁に乗り上げた。
The plan hit a snag (literally: ran aground on a hidden reef).
岩礁地帯には多くの生物が生息している。
Many creatures inhabit the rocky reef area.