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Lowell's 1909 map of Mars
Percival Lowell's 1909 map of Mars showing canals as thin lines and "oases" as round blobs at the major intersections of canals
A term introduced by Percival Lowell in 1895 to describe dark, round features on the surface of Mars which he claimed lay at the major intersections of a Martian canal network. These features had been referred to as "lakes" by William Henry Pickering in 1892. Lowell, however, believed they were extensive regions of vegetation irrigated by canal-borne polar meltwater. They were an important feature of his theory concerning an extant Martian civilization.

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   • canals on Mars
   • vegetation on Mars

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