Ideographic: A furrow cut in the earth 土 by a stream 川; 川 also provides the pronunciationRadical:

meaning for zhèn:

  • - (dialect) drainage ditch between fields (Taiwan pr. zun4)
  • - used in place names, notably 深圳 Shenzhen subprovincial city in Guangdong, special economic zone close to Hong KongShenzhen Stock Exchange SZSEShenzhen subprovincial city in Guangdong, special economic zone close to Hong KongShenzhen or Shamchun river Guangdong, the border between Hong Kong new territories and PRCShenzhen Stock Exchange, abbr. to 深交所