古巴 is the Chinese name for Cuba, the Caribbean island nation. It is a phonetic transliteration of the English name "Cuba." It is used in geographical, political, and news contexts, as in 古巴政府 (the Cuban government).
他去年去古巴旅行了一趟,觉得特别有意思。
Tā qùnián qù Gǔbā lǚxíngle yī tàng, juéde tèbié yǒu yìsi.
He took a trip to Cuba last year and found it really interesting.
古巴以雪茄和老爷车闻名于世。
Gǔbā yǐ xuějiā hé lǎoyéchē wénmíng yú shì.
Cuba is world-famous for its cigars and classic cars.
我对古巴的音乐和文化非常感兴趣。
Wǒ duì Gǔbā de yīnyuè hé wénhuà fēicháng gǎn xìngqù.
I'm very interested in Cuban music and culture.