Ideographic: A road being split 分 by a mountain 山Radical:

meaning for chà:

  • - fork in road
  • - bifurcation
  • - branch in road, river, mountain range etc
  • - to branch off
  • - to turn off
  • - to diverge
  • - to stray (from the path)
  • - to change the subject
  • - to interrupt
  • - to stagger (times)to diverge
  • - to branch off the road
  • - to change (the subject)interruption
  • - to interrupt (esp. talk)
  • - to change the subjectrailroad switchjunction
  • - fork in roadfork in the road

chángjiāng长江
zài
hékǒu河口
chǔfèn处分
chà
xíngchéng形成
yīgè一个
sānjiǎozhōu三角洲

The Changjiang River divides at its mouth and forms a delta.