Ganja is a slang term for cannabis and the word is associated with the West Indies, but actually originated in India.
Merriam-Webster Online Dictionary
ganja (noun) a potent and selected preparation of marijuana used especially for smoking , broadly - marijuana
Ganja (Wikipedia)
Ganja (/ˈɡɑːndʒə/, UK: /ˈɡændʒə/; Hindi pronunciation: [ɡaːɲd͡ʒaː]) is one of the oldest and most commonly used synonyms for cannabis flower, specifically marijuana or hashish. Its usage in English dates to before 1689.

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Ganja (Wiktionary)
English
Alternative forms
- ganga, gunja
- gunga, gunjah (dated)
Etymology
Borrowed from Hindi गांजा (gāñjā), ultimately from Sanskrit गञ्जा (gañjā, “hemp”). First use appears c. 1800.
Pronunciation
- (India) IPA(key): /ˈɡɑn.d͡ʒɑ/
- (Received Pronunciation) IPA(key): /ˈɡæn.dʒə/
- (General American) IPA(key): /ˈɡɑn.d͡ʒə/
Noun
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Cannabis, Mary Jane, Ganja, Dope, Reefer, Hash, Bud, Chronic, Skunk, Green, Smoke, Joint, Blunt, Doobie, Spliff, Kush, Hemp, Sativa, Indica

