Ocean Riddles With Answers
Updated · Best Riddles With Answers editorial team
Quick answer: This page offers 42 ocean riddles with answers for children, classrooms and sea lovers. The easy riddles describe familiar sea animals and boats, the middle sets cover reefs, tides and lighthouses, and the hard set tests real facts about the deep with a few number puzzles. All of them are clean and family friendly.
Easy Ocean Riddles
I rise, I curl and I crash on the shore, and I never stand still. What am I?
A wave
The Moon pulls me in and out twice a day, so the beach is wide and then narrow. What am I?
The tide
I am the largest animal in the sea, and I breathe air through a hole on top of my head. What am I?
A whale
My fin cuts the surface of the water, and my mouth is full of rows of sharp teeth. What am I?
A shark
I have five arms, no head and no bones, and I live on the sea floor. What am I?
A starfish
I am soft and see-through, I have no bones and no brain, and I float and sting. What am I?
A jellyfish
Inside an oyster, a grain of grit turns me into a smooth white gem. What am I?
A pearl
I walk sideways on the sand, and I have two claws that pinch. What am I?
A crab
I am clever and friendly, I click and whistle, and I leap out of the waves. What am I?
A dolphin
I float on the water, carry cargo or passengers, and have a horn. What am I?
A ship
I am a heavy iron hook, and a sailor drops me to stop the boat from drifting. What am I?
An anchor
I am a green plant that grows in the sea, and I feel slimy when I wash up on the beach. What am I?
Seaweed
Trickier Ocean Riddles
I stand on the coast like a tall tower, and my light turns round to warn ships of the rocks. What am I?
A lighthouse
I am a colourful underwater city built by tiny animals called polyps. What am I?
A coral reef
I am a ship that can sink on purpose and then rise again. What am I?
A submarine
I am the white stuff that makes the sea taste so strong that you cannot drink it. What am I?
Salt
Most of me hides below the water, and ships fear what you cannot see. What am I?
An iceberg
I am a tiny fish with a horse-shaped head, and the dad carries the babies. What am I?
A seahorse
I carry my home on my back, I swim for thousands of kilometres, and I lay eggs on a beach. What am I?
A sea turtle
I am the biggest and deepest ocean in the world. What am I?
The Pacific Ocean
An earthquake under the sea can send me racing to the coast as a huge wall of water. What am I?
A tsunami
A sailor reads me to find north, and my needle never stops pointing the same way. What am I?
A compass
I am like a river in the middle of the sea, always moving the same way. What am I?
An ocean current
A stranded sailor writes on paper, seals me in glass and throws me into the sea, hoping someone will find me. What am I?
A message in a bottle
Hard Ocean Riddles
I am the deepest place in the ocean, almost eleven kilometres down, in the western Pacific. What am I?
The Mariana Trench
I have three hearts, blue blood and eight arms. What am I?
An octopus
A cargo ship sails from a river out into the ocean. Does it float higher or lower in the water?
Higher, because salt water is denser than fresh water and pushes up more
A ship sails at 15 knots, which means 15 nautical miles every hour. How far does it go in 6 hours?
90 nautical miles, because 15 x 6 = 90
A diver goes down 12 metres, comes up 5 metres, then goes down another 8 metres. How deep is she now?
15 metres, because 12 - 5 + 8 = 15
High tide arrives at 6:00 in the morning. About when is the next high tide?
About 6:25 in the evening, because high tides are roughly 12 hours and 25 minutes apart
Seawater is about 3.5 percent salt by weight. How many grams of salt are in 200 grams of seawater?
7 grams, because 200 x 0.035 = 7
I am the largest animal that has ever lived, bigger than any dinosaur found, and I eat tiny shrimp-like krill. What am I?
A blue whale
I cover most of the Earth, yet a sailor lost on me can die of thirst. What am I?
The ocean (seawater is too salty to drink)
I live safely among the stinging tentacles of an anemone, and I am orange with white stripes. What am I?
A clownfish
Quick-Fire Ocean Riddles
A white bird that steals chips at the beach. What am I?
A seagull
A floating marker that bobs on the waves. What am I?
A buoy
A walkway built out over the water. What am I?
A pier
Red when it is cooked, with two big claws. What am I?
A lobster
A tube to breathe through while your face is in the water. What am I?
A snorkel
Worn on your feet to swim faster. What are we?
Flippers
Logs tied together to make a floating platform. What am I?
A raft
A sheltered place where ships tie up. What am I?
A harbour
How to Use These Ocean Riddles
Read these at the beach, in a swimming lesson or before a visit to an aquarium. Younger children can match each riddle to an animal picture, and the easy set needs no background knowledge beyond sea creatures they already know.
In class, pair the hard riddles with a map or globe. After each answer, ask pupils where the place or animal is found and what makes it unusual, to turn a puzzle into a mini lesson.
Frequently Asked Questions
What is a good ocean riddle for kids?
Try 'I have five arms, no head and no bones, and I live on the sea floor.' The answer is a starfish. Riddles about crabs, whales and waves are easy for young children.
Why is the ocean salty?
Rain slowly washes tiny amounts of salt out of rocks on land, and rivers carry it to the sea. When ocean water evaporates, the salt stays behind, so over millions of years the sea has become salty.
Which animal has three hearts?
The octopus has three hearts. Two pump blood through its gills and one sends it around the rest of the body. Its blood is blue because it uses copper to carry oxygen instead of iron.
Why does a ship float higher in the sea than in a river?
Salt water is denser than fresh water, so it pushes up on the hull more strongly. A ship therefore sinks a little lower in a river and rides higher when it enters the ocean.
