水系 (shuǐ xì) — river system, drainage network

Definition

Examples

• 中国的水系非常复杂。
  Zhōng guó de shuǐ xì fēi cháng fù zá.
  China's river system is very complex.
• 这个水系覆盖面积很大。
  Zhè ge shuǐ xì fù gài miàn jī hěn dà.
  This drainage network covers a large area.
• 地理学家正在研究这条河流的水系。
  Dì lǐ xué jiā zhèng zài yán jiū zhè tiáo hé liú de shuǐ xì.
  Geographers are studying the river system of this river.