Coastal and oceanic landforms

A coastline or a 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.

The continental shelf is an underwater landmass which extends from a continent, resulting in an area of relatively shallow water known as a shelf sea.

Geologically, a fjord or fiord (English pronunciation: /ˈfjɔːrd/ or /fiˈɔːrd/) is a long, narrow inlet with steep sides or cliffs, created by glacial erosion.

The oceanic trenches are hemispheric-scale long but narrow topographic depressions of the sea floor.

An estuary is a partially enclosed coastal body of brackish water with one or more rivers or streams flowing into it, and with a free connection to the open sea.

A guyot (pronounced /ɡiːˈjoʊ/), also known as a tablemount, is an isolated underwater volcanic mountain (seamount), with a flat top over 200 m (660 ft) below the surface of the sea.

A mid-ocean ridge is an underwater mountain system formed by plate tectonics.

A seamount is a mountain rising from the ocean seafloor that does not reach to the water's surface (sea level), and thus is not an island.

The seabed (also known as the seafloor, sea floor, or ocean floor) is the bottom of the ocean.

An archipelago (/ɑːrkᵻˈpɛləɡoʊ/ ark-i-PEL-ə-goh), sometimes called an island group or island chain, is a chain, cluster or collection of islands.

A bay is a body of water connected to an ocean or lake, formed by an indentation of the shoreline.

In geography, a cape is a headland or a promontory of large size extending into a body of water, usually the sea.

In physical geography, a dune is a hill of sand built by wind or the flow of water.

A lagoon is a shallow body of water separated from a larger body of water by barrier islands or reefs.

A submarine canyon is a steep-sided valley cut into the seabed of the continental slope, sometimes extending well onto the continental shelf, having nearly vertical walls, and occasionally having canyon wall heights of up to 5 km, from canyon floor to canyon rim, as with the Great Bahama Canyon.

List of submarine topographical features, oceanic landforms and topographic elements.

The intertidal zone, also known as the foreshore and seashore and sometimes referred to as the littoral zone, is the area that is above water at low tide and under water at high tide (in other words, the area between tide marks).

A cold seep (sometimes called a cold vent) is an area of the ocean floor where hydrogen sulfide, methane and other hydrocarbon-rich fluid seepage occurs, often in the form of a brine pool.

Tide pools, or rock pools, are rocky pools on the sea shore which are filled with seawater.

A rocky shore is an intertidal area of seacoasts where solid rock predominates.

Fajãs is Portuguese for the supratidal talus-platform geology constructed from landslides or lava flows, that are relatively common coastal features, occurring on the toe of cliffs.