rén shān rén hǎi

ㄖㄣˊ ㄕㄢㄖㄣˊ ㄏㄞˇ

1(idiom) multitude; vast crowd

jiā佳jié节shí时qī期，jīng dū京都rén shān rén hǎi人山人海。

佳节时期，京都人山人海。

Kyoto is packed with people during the holiday season.

体育场里人山人海。

There were lots of people in the stadium.

那里人山人海。

There's a huge number of people there.