河里 (hélǐ): in the river

Meanings

Háizimen zài hélǐ yóuyǒng.

The children are swimming in the river.

Hélǐ yǒu hěn duō yú.

There are a lot of fish in the river.

grammar

里 here is a location suffix meaning 'inside/in.' It attaches to place nouns: 河里 (in the river), 家里 (at home), 心里 (in one's heart).

河 hé

里 lǐ