A huge crowd of people; packed with people.
人群如山似海。形容人聚集得非常多。
明·施耐庵《水浒全传》第五十一回每日有那一般打散，或是戏舞，或是吹弹，或是歌唱，赚得那人山人海价看。”
The square on New Year's Eve was a sea of people, truly a mountain of people and an ocean of people.
Learn the next connected idiom: 人山人海 (rén shān rén hǎi) → 海纳百川 (hǎi nà bǎi chuān)
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