Contains

• bank

  A long ridge or pile; "a huge bank of earth".

• reef

  A submerged ridge of rock or coral near the surface of the water.

• bar

  A submerged (or partly submerged) ridge in a river or along a shore; "the boat ran aground on...

• dune

  A ridge of sand created by the wind; found in deserts or near lakes and oceans.

• shelf

  A projecting ridge on a mountain or submerged under water.

• esker

  (geology) a long winding ridge of post glacial gravel and other sediment; deposited by meltwater...

• ripple mark

  One of a series of small ridges produced in sand by water currents or by wind.