Articles before Proper (Geographical) Names

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These proper names require the use of “the”:
– mountain ranges (The Alps)
– rivers (The Vistula)
– seas (The Baltic Sea)
– oceans (The Atlantic)
– archipelagos (The Seychelles)
– deserts (The Sahara)
– regions (the Middle East)
– certain states: the USA, the UK, the Netherlands

You should not use any article before: continents (Asia), countries (Italy), cities (Paris), lakes (Lake Victoria), single islands (Cuba), single mountain peaks (Mt Everest), peninsulas (Kamchatka).