Underwater obstacle
The crossword clue "Underwater obstacle" is answered by REEF, a 4-letter entry. Used 8 times across 6 distinct years; most recently in 2018; first recorded in 2000. It appears in 3 publications in the xd corpus. Every figure on this page comes from the collection data itself, never from a guess.
The answer
REEF
4 letters. See every clue for this answer on the REEF answer page.
Used 8 times across 6 distinct years; most recently in 2018; first recorded in 2000. It appears in 3 publications in the xd corpus. Frequency and last-seen figures come from the xd crossword corpus only.
Other clues for REEF
Every other clue in this collection answered by REEF, most used first.
- Coral formation - used 107 times, most recently in 2026
- Coral ridge - used 42 times, most recently in 2026
- Great Barrier ___ - used 39 times, most recently in 2026
- Snorkeling site - used 38 times, most recently in 2026
- Coral structure - used 34 times, most recently in 2026
- Sailing hazard - used 24 times, most recently in 2025
- Marine hazard - used 21 times, most recently in 2018
- Snorkeling spot - used 20 times, most recently in 2026
- Coral construction - used 18 times, most recently in 2025
- Boating hazard - used 16 times, most recently in 2023
- Coral habitat - used 16 times, most recently in 2025
- Navigation hazard - used 13 times, most recently in 2016
- Offshore hazard - used 12 times, most recently in 2016
- Shipwreck site - used 12 times, most recently in 2023
- Atoll protector - used 11 times, most recently in 2019
- Coral creation - used 11 times, most recently in 2022
- Shoal - used 11 times, most recently in 2002
- Atoll barrier - used 10 times, most recently in 2021
- Australia's Great Barrier ___ - used 10 times, most recently in 2025
- Coral ___ - used 10 times, most recently in 2025
- Shorten sail - used 9 times, most recently in 1996
- Nautical hazard - used 8 times, most recently in 2017
- Sea hazard - used 8 times, most recently in 2007
- Shipping hazard - used 8 times, most recently in 2021
- Boat bottom bumper - used 6 times, most recently in 2013
- Boater's hazard - used 6 times, most recently in 2016
- Coral colony - used 6 times, most recently in 2025
- Coral ecosystem - used 6 times, most recently in 2026
- Snorkeling locale - used 6 times, most recently in 2024
Related clues
Clues in this collection of the same answer length that share a word with this clue, or match its answer pattern when no word is shared. Most used first.
- Obstacle - SNAG, used 100 times
- Unexpected obstacle - SNAG, used 49 times
- Unforeseen obstacle - SNAG, used 30 times
- Hidden obstacle - SNAG, used 27 times
- Slalom obstacle - GATE, used 15 times
- Sudden obstacle - SNAG, used 9 times
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