• 10 parts
  • Checked October 2026

Labeling a Coral Reef

A numbered coral reef to print and label: ten parts, a line for each name, and an answer key.

Labeling a Coral Reef

Name Date

Numbered worksheet

1 2 3 4 5 6 7 8 9 10
More options

Write the name of each numbered part.Answer key

  1. Reef crest
  2. Lagoon
  3. Fore reef
  4. Reef flat
  5. Drop-off
  6. Patch reef
  7. Fringing reef
  8. Barrier reef
  9. Atoll
  10. Volcanic island

Drawn for this site on 2026-10-03 from plain geometry. Licence: own work.

Each numbered ring is a button. Use the arrow keys to move between them and Enter to choose. Names are read out in Study, and once a part is answered.

Next step Read every name on the labeled coral reef

All 10 parts on the diagram

Show the list

Across a reef 6

  1. Reef crest The highest part of the reef, where the waves break. It is almost always uncovered at low tide.
  2. Lagoon Sheltered water between the shore and the reef.
  3. Fore reef The seaward slope, running down into deeper water. It takes the force of the incoming waves.
  4. Reef flat The shallow, sheltered side behind the reef crest. Its floor is coral rock and loose sand.
  5. Drop-off The steep fall of the reef into deep water.
  6. Patch reef A small reef standing alone inside a lagoon.

Kinds of reef 4

  1. Fringing reef A reef that grows directly from the shore. It is the most common kind.
  2. Barrier reef A reef parted from the shore by a lagoon.
  3. Atoll A ring of reef around a lagoon, with no island inside.
  4. Volcanic island The island a fringing reef first grows around. When it sinks below the sea, the reef left behind is an atoll.

How this list was compiled: Every name checked on 2026-10-03 in at least two of these, counting the two NOAA pages as one source. (1) NOAA National Ocean Service, Corals tutorial, How do coral reefs form?, https://oceanservice.noaa.gov/education/tutorial_corals/coral04_reefs.html (fringing reefs, barrier reefs and atolls; the lagoon; the volcanic island that sinks; fringing reefs the most common). (2) The same tutorial, Coral reef zones, https://oceanservice.noaa.gov/education/tutorial_corals/media/supp_coral04b.html (reef flat, reef crest or algal ridge, forereef or reef front, the dropoff). (3) Wikipedia, Coral reef, sections Types and Zones, https://en.wikipedia.org/wiki/Coral_reef (fore reef, reef crest, back reef, reef flat, reef drop-off, reef lagoon, patch reef; the three classical kinds of reef). (4) Rützler and Macintyre, The Atlantic Barrier Reef Ecosystem at Carrie Bow Cay, Belize, Smithsonian Contributions to the Marine Sciences 12 (1982), read on the Internet Archive, https://archive.org/details/smithsoniancont121982smit (a measured barrier reef in five units: lagoon, back reef, reef crest, inner fore reef, outer fore reef; patch reefs in the lagoon; the reef flat; the reef drop-off). Licence: own work

The drawing: Drawn for this site on 2026-10-03 from plain geometry. Own original drawing; nothing is traced or copied. Licence: own work

How it works

Labeling a coral reef on this sheet takes ten names. Numbers 1 to 6 are on a reef cut through from an island's beach to deep water. Numbers 7 to 10 are on three reefs seen from above.

Read the full guide

Coral reef label the diagram: word bank

In alphabetical order, to copy onto the board: atoll, barrier reef, drop-off, fore reef, fringing reef, lagoon, patch reef, reef crest, reef flat, volcanic island.

From the beach to deep water, by number

From the island outward the numbers read 2 (lagoon), 4 (reef flat), 1 (reef crest), 3 (fore reef) and 5 (drop-off). 6 is the mound standing alone in the lagoon (patch reef). Seen from above, the reef at 7 lies against its island's beach (fringing reef), the reef at 8 has water between it and its island (barrier reef) and the reef at 9 is a ring with only water inside (atoll). 10 is the mountain with the crater (volcanic island).

  • When marking, algal ridge is right on line 1 and forereef or reef front on line 3: NOAA uses those names too.

Questions and answers

What lives on the reef crest?

Very little coral. The crest takes the full force of incoming waves, and NOAA says living corals are practically nonexistent there. Small crabs, shrimps and other animals often live in the cavities under it, sheltered from the waves.

What lives on the drop-off of a coral reef?

More kinds of coral can grow there, because the waves are weaker. Deeper still, where less light reaches, sponges, sea whips, sea fans and corals that build no reef gradually take the place of the stony corals.

Are there islands on an atoll?

There can be, as the bottom picture shows. Parts of the ring of reef can rise above the water as one or more islands. An atoll is usually circular or oval, and gaps in the reef open into the lagoon in the middle.

Do soft corals build reefs?

No. Coral reefs are made by hard, or stony, corals. Soft corals do not form reefs, but they are often found on them.

More quizzes

Show 7 more

Browse Science Quizzes