Plains

Plains is one of the five basic land types and provides white mana, which is required to cast white spells.

Additionally there is a snow variant, the Snow-Covered Plains.

Esper

 * Cloudheath
 * Glass Dunes

Plains of Cabralin

 * Cabralin Shire

Aerona

 * Gurdurngs

Jamuraa

 * Daraja Plains
 * Mtenda Plains
 * Unyaro Plains

Otaria

 * Daru Plains

Terisiare

 * Adarkar Wastes

The Domains

 * Plains of Sursi

Corondor

 * Darkling Plains
 * Plains of Coloni
 * Plains of Urlan

Plains of Kamigawa

 * Towabara which contains the Araba

Plains of Kephalai

 * Foltessa
 * Tornadic Steppes

Plains of Mirrodin

 * Razor Fields

Plains of Serra's Realm
Serra's Realm solely consists of Floating Plains

Plains on unknown planes

 * Quarum Trench Gnomes

Rules
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Trivia

 * Though there is a clear mechanical difference, in flavor there is a significant overlap between deserts and plains, with sun-scorched, dune-y places like Tarkir's and Esper's deserts being typed as plains.