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Seaweed on the Welsh coastline
A tidal pool with starfish and seaweeds at Titahi Beach near Wellington in New Zealand
Extreme close-up of sargassum seaweed under rippling water with flowing leaves.
Seaside crustacean and marine life, Australian Coastline.
A close-up, macro perspective of colorful kelp and smooth stones on Little Hunters Beach in Acadia National Park, Maine.  Many of the rugged beaches in Acadia are filled with with beautiful colorful pebbles and boulders that that have been eroded by ocean waves into smooth and round shapes.
This is a photograph of starfish visible on the rocks at low tide on Bandon Beach along the Oregon coast of the Pacific Northwest USA.
Seaweed and sand on North Sea coastline
A blue sea anemone in a shallow rock pool, Santa Barbara, California.
Fucus vesiculosus, known by the common names bladderwrack and rock wrack. It was the original source of iodine
Seasweed on rocks on Durness Beach (Scottish Highlands)
Sea star partially obscured by seaweed on a sandy beach, with waves washing over it.
More than 4,000 species of green algae exist on the planet. Green algae can be found in marine or freshwater habitats, and some even thrive in moist soils. These algae come in three forms: unicellular, colonial, or multicellular.
Colourful seaweed waving in the tidal waters at Mevagissey, Cornwall
Tide pools with sea life
Marine life in exposed rock pools at low tide, Saunton Sands, Devon
A sunburst sea anemone in a tidal pool on the coast of Newport Beach, California during the winter.
A Starburst Anemone, Anthopleura sola, shimmers in a tide pool along the Humboldt County coast of California.
Wet shiny seaweed on the Thames estuary
Small Crab Seen at Botanical Beach during Low Tides (British Columbia, Canada)
Masses of kelp, a kind of giant seaweed, in the ocean, brightly lit.
An image of several large rocks covered in thick green sea grass at low tide.
Gwithian Towans, North Cornwall, England UK. Long exposure looking out to sea
Sargassum seaweed washed up in large quantities on the beaches of Las Palmas de Gran Canaria
Autumn mood in nature. Waves rolling in
Image of Purple and green kelp detail on rocks by beach
Oyster farming reefs by the seaside
Colourful, fresh Bladderwrack seaweed, washed up on Hebridean Island, Scotland. Concept: Health and Nature.  Landscape, Horizontal.  Space for copy.
River Moss, East River, New York
Red algae growth in clear blue water
The aggregating anemone, Anthopleura elegantissima, or clonal anemone, is the most abundant species of sea anemone found on rocky Pacific coast of North America. This cnidarian hosts endosymbiotic algae called zooxanthellae.  Salt Point State Park, California.
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