• 12 parts
  • Checked October 2026

Ocean Wave Diagram Labeled

One wave out at sea and the same waves reaching a beach, with every part named.

Ocean Wave Diagram Labeled

Name Date

Tap any part to read, rename or leave it out

1 2 3 4 5 6 7 8 9 10 11 12
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Write the name of each numbered part.Answer key

  1. Crest
  2. Trough
  3. Wavelength
  4. Wave height
  5. Orbital motion
  6. Wave base
  7. Direction of travel
  8. Swell
  9. Breaker
  10. Surf zone
  11. Swash
  12. Backwash

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 Next: the parts of a beach

All 12 parts on the diagram

Show the list

Start here: main parts 5

  1. Crest The highest part of a wave.
  2. Trough The lowest part of a wave.
  3. Wavelength The distance from one crest to the next crest.
  4. Wave height The vertical distance between a trough and a crest.
  5. Breaker A wave that has grown too steep and falls forward.

A wave in deep water 3

  1. Orbital motion The water moves in circles as a wave passes. The circles shrink with depth.
  2. Wave base The depth below which waves no longer move the water. It lies about half a wavelength down.
  3. Direction of travel The way the wave moves. A wave carries energy forward, not water.

Reaching the shore 4

  1. Swell Smooth, regular waves that have left the wind that made them.
  2. Surf zone The water between the breaking waves and the beach.
  3. Swash Water from a broken wave rushing up the beach.
  4. Backwash The same water running back down the beach to the sea.

How this list was compiled: Every name and definition checked on 2026-10-03 in at least two independent sources. (1) NOAA: National Weather Service JetStream, Anatomy of a Wave, https://www.noaa.gov/jetstream/ocean/waves/jetstream-max-anatomy-of-wave (crest, trough, wave height, wavelength, the circular orbital motion of the water, the wave slowing, growing taller and breaking where the depth is half its length), and Waves, https://www.noaa.gov/jetstream/ocean/waves (swell, direction of travel); National Ocean Service, Currents tutorial, Waves, https://oceanservice.noaa.gov/education/tutorial_currents/03coastal1.html (breakers), and Why does the ocean have waves?, https://oceanservice.noaa.gov/facts/wavesinocean.html (waves transmit energy, not water); National Weather Service glossary, https://forecast.weather.gov/glossary.php?word=surf%20zone (surf zone, breakers, swell). (2) Paul Webb, Introduction to Oceanography (Roger Williams University), 10.1 Wave Basics, https://rwu.pressbooks.pub/webboceanography/chapter/10-1-wave-basics/ (crest, trough, wave height, wavelength, still water level, orbital motion, wave base at half the wavelength), 10.3 Waves on the Shore, https://rwu.pressbooks.pub/webboceanography/chapter/10-3-waves-on-the-shore/ (waves touching bottom, slowing and growing; breaker; swell), and 13.2 Longshore Transport, https://rwu.pressbooks.pub/webboceanography/chapter/13-2-longshore-transport/ (surf zone, swash, backwash). (3) National Park Service, Glossary of Geologic Terms, table at https://www.nps.gov/common/uploads/sortable_dataset/geology/DBD85DC6-CA83-CEE3-0786454132D79FCD/nri-GlossaryTable.csv (wave base). (4) Wikipedia, text only: Wind wave, https://en.wikipedia.org/wiki/Wind_wave (wave height, wavelength, direction of propagation, circular orbits in deep water, swell); Wave base; Breaking wave; Surf zone; Swash (uprush and backwash). Licence: own work

The drawing: Drawn for this site on 2026-10-03 from plain geometry. The sea and the beach are invented; nothing is traced or copied. Licence: own work

How it works

This ocean wave diagram, labeled part by part, shows a wave in deep water and then waves reaching a beach. Read the names, tap a part for one line about it, then quiz yourself or print it blank.

Read the full guide

Out at sea

The crest is the highest part of a wave and the trough the lowest. Wave height is measured between them, and wavelength from one crest to the next. Under the surface the water moves in circles that shrink with depth and end at the wave base.

At the shore

Swell is the low, even waves that arrive from far away. Where the sea is shallower than the wave base, the waves slow down, bunch up and grow until one falls forward as a breaker. Broken water fills the surf zone, runs up the beach as swash and back down as backwash.

  • A floating bird bobs in a circle as each wave passes. It is not carried along with the wave.

Questions and answers

What are the parts of an ocean wave?

Crest, trough, wavelength and wave height are read off the wave itself. Under it are the orbital motion of the water and the wave base. At the shore come swell, the breaker, the surf zone, swash and backwash.

Why do waves break near the shore?

In shallow water the bottom of a wave drags on the sea floor and slows down. The waves bunch together and grow taller until the top outruns the base and falls forward as a breaker.

Does the water move forward with an ocean wave?

Hardly at all in deep water. A wave carries energy, not water. As it passes, the water moves in a circle and ends up close to where it began.

What is the difference between swash and backwash?

Swash is the water that rushes up the beach after a wave breaks. Backwash is the same water running back down the beach to the sea.

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