Refers to all corners of the country or the whole world; people from various places.
指全国各地，有时也指世界各地。现有时也比喻广泛的团结。
《周礼·夏官·职方氏》其浸五湖。”《论语·颜渊》四海之内，皆兄弟也。”唐·吕岩《绝句》斗笠为帆扇作舟，五湖四海任遨游。”
People from all corners of the country came together at the conference.
Learn the next connected idiom: 五湖四海 (wǔ hú sì hǎi) → 海纳百川 (hǎi nà bǎi chuān)
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