Correct

干流

/ gànliú / 
Strokes

Definition

main stream (of a river)

Example

As a Noun

trunk stream; master stream; main stream

1
ChángJiāng
长江
gànliú
干流

trunk stream of Yangtze River

2
Gànliú
干流
hé
和
zhīliú
支流

trunk stream and its tributaries