Sea

maritimemarineat seasea surfaceList of seasthe seaseassurfacearm of the seamarine environment
The sea, the world ocean or simply the ocean is the connected body of salty water that covers over 70% of Earth's surface (361132000 km2, with a total volume of roughly 1,332,000,000 km3).wikipedia
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Body of water

bodies of waterwater bodieswaterbodies
The sea, the world ocean or simply the ocean is the connected body of salty water that covers over 70% of Earth's surface (361132000 km2, with a total volume of roughly 1,332,000,000 km3).
The term most often refers to oceans, seas, and lakes, but it includes smaller pools of water such as ponds, wetlands, or more rarely, puddles.

Caspian Sea

CaspianCaspian regionCaspian Sea basin
The word sea is also used to denote smaller, partly landlocked sections of the ocean and certain large, entirely landlocked, saltwater lakes, such as the Caspian Sea and the Dead Sea.
The Caspian Sea is the world's largest inland body of water, variously classed as the world's largest lake or a full-fledged sea.

Pacific Ocean

PacificSouth PacificWestern Pacific
It has been travelled and explored since ancient times, while the scientific study of the sea—oceanography—dates broadly from the voyages of Captain James Cook to explore the Pacific Ocean between 1768 and 1779.
Its mean depth is 4000 m. The Mariana Trench in the western North Pacific is the deepest point in the world, reaching a depth of 10911 m. The western Pacific has many peripheral seas.

Ocean

marineoceansmaritime
Salinity varies widely, being lower near the surface and the mouths of large rivers and higher in the depths of the ocean; however, the relative proportions of dissolved salts varies little across the oceans. There is no sharp distinction between seas and oceans, though generally seas are smaller, and are often partly (as marginal seas) or wholly (as inland seas) bordered by land.
Strictly speaking, a sea is a body of water (generally a division of the world ocean) partly or fully enclosed by land, though "the sea" refers also to the oceans.

Littoral zone

littoralsublittoralnearshore
A wide variety of organisms, including bacteria, protists, algae, plants, fungi, and animals, live in the sea, which offers a wide range of marine habitats and ecosystems, ranging vertically from the sunlit surface and shoreline to the great depths and pressures of the cold, dark abyssal zone, and in latitude from the cold waters under polar ice caps to the colourful diversity of coral reefs in tropical regions.
The littoral zone or nearshore is the part of a sea, lake, or river that is close to the shore.

Naval warfare

naval battlenaval historynaval historian
Other human uses of the sea include trade, travel, mineral extraction, power generation, warfare, and leisure activities such as swimming, sailing, and scuba diving.
Naval warfare is human combat in and on the sea, the ocean, or any other battlespace involving a major body of water such as a large lake or wide river.

Oceanography

oceanographeroceanographicmarine science
It has been travelled and explored since ancient times, while the scientific study of the sea—oceanography—dates broadly from the voyages of Captain James Cook to explore the Pacific Ocean between 1768 and 1779.
Humans first acquired knowledge of the waves and currents of the seas and oceans in pre-historic times.

List of seas

marginal seaseasmarginal seas
There is no sharp distinction between seas and oceans, though generally seas are smaller, and are often partly (as marginal seas) or wholly (as inland seas) bordered by land.

Inland sea (geology)

inland seaepeiric seaepicontinental sea
There is no sharp distinction between seas and oceans, though generally seas are smaller, and are often partly (as marginal seas) or wholly (as inland seas) bordered by land.
An inland sea (also known as an epeiric sea or an epicontinental sea) is a shallow sea that covers central areas of continents during periods of high sea level that result in marine transgressions.

Sargasso Sea

SargassoNorth Atlantic Subtropical Gyre
However, the Sargasso Sea has no coastline and lies within a circular current, the North Atlantic Gyre.
Unlike all other regions called seas, it has no land boundaries.

River

riverineriparianleft bank
The remainder (about 0.65% of the whole) form underground reservoirs or various stages of the water cycle, containing the freshwater encountered and used by most terrestrial life: vapor in the air, the clouds it slowly forms, the rain falling from them, and the lakes and rivers spontaneously formed as its waters flow again and again to the sea.
A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river.

Marine biology

marinemarine biologistmarine life
Marine biology (biological oceanography) studies the plants, animals, and other organisms inhabiting marine ecosystems.
Marine biology is the scientific study of marine life, organisms in the sea.

Water

H 2 OHOliquid water
Earth is the only known planet with seas of liquid water on its surface, although Mars possesses ice caps and similar planets in other solar systems may have oceans.
Much of long-distance trade of commodities (such as oil and natural gas) and manufactured products is transported by boats through seas, rivers, lakes, and canals.

Dead Sea

The Dead SeaSalt SeaDead Sea Panorama Complex
The word sea is also used to denote smaller, partly landlocked sections of the ocean and certain large, entirely landlocked, saltwater lakes, such as the Caspian Sea and the Dead Sea.
In comparison, the salt in the water of most oceans and seas is approximately 85% sodium chloride.

Swell (ocean)

swellsswellocean swell
In open water, when the wind blows continuously as happens in the Southern Hemisphere in the Roaring Forties, long, organised masses of water called swell roll across the ocean.
A swell, in the context of an ocean, sea or lake, is a series of mechanical waves that propagate along the interface between water and air and thus are often referred to as surface gravity waves.

Coast

coastalcoastlineseaboard
The zone where land meets sea is known as the coast and the part between the lowest spring tides and the upper limit reached by splashing waves is the shore.
The coast, also known as the coastline or seashore, is the area where land meets the sea or ocean, or a line that forms the boundary between the land and the ocean or a lake.

Cape (geography)

capecapesgeographic cape
A headland is a point of land jutting out into the sea and a larger promontory is known as a cape.
In geography, a cape is a headland or a promontory of large size extending into a body of water, usually the sea.

Phytoplankton

planktonic algaeplanktonicphytoplanktonic
These are mainly algae, including phytoplankton, with some vascular plants such as seagrasses.
Phytoplankton obtain energy through the process of photosynthesis and must therefore live in the well-lit surface layer (termed the euphotic zone) of an ocean, sea, lake, or other body of water.

List of gulfs

gulfgulfs
The indentation of a coastline, especially between two headlands, is a bay, a small bay with a narrow inlet is a cove and a large bay may be referred to as a gulf.
A gulf in geography is a large bay that is an arm of an ocean or sea.

Seawall

sea wallseawallssea walls
Governments make efforts to prevent flooding of the land by the building of breakwaters, seawalls, dykes and levees and other sea defences.
A seawall (or sea wall) is a form of coastal defense constructed where the sea, and associated coastal processes, impact directly upon the landforms of the coast.

Shoal

sandbarsandbanksand bar
It may occur at a gap in a sandbar or near a man-made structure such as a groyne.
Shoals can appear as a coastal landform in the sea, where they are classified as a type of ocean bank, or as fluvial landforms in rivers, streams, and lakes.

River delta

deltadeltaicdeltas
Sediment carried to the sea by rivers settles on the seabed causing deltas to form in estuaries.
This occurs where a river enters an ocean, sea, estuary, lake, reservoir, or (more rarely) another river that cannot carry away the supplied sediment.

Bay

embaymentgulfbays
The indentation of a coastline, especially between two headlands, is a bay, a small bay with a narrow inlet is a cove and a large bay may be referred to as a gulf.
A large bay is usually called a gulf, sea, sound, or bight.

Shore

shorelineinshorewaterfront
The zone where land meets sea is known as the coast and the part between the lowest spring tides and the upper limit reached by splashing waves is the shore.
A shore or a shoreline is the fringe of land at the edge of a large body of water, such as an ocean, sea, or lake.

Demersal zone

demersalbenthopelagicbathydemersal
Alternatively, marine habitats can be divided vertically into pelagic (open water), demersal (just above the seabed) and benthic (sea bottom) habitats.
The demersal zone is the part of the sea or ocean (or deep lake) consisting of the part of the water column near to (and significantly affected by) the seabed and the benthos.