Ideographic: Difficult 难 waters 氵 to navigate; 难 also provides the pronunciationRadical:

meaning for tān:

  • - beach
  • - shoal
  • - rapids
  • - Classifiers: 片
  • - classifier for liquids: pool, puddlebeach
  • - sandy shore
  • - Classifiers: 片 beach
  • - Classifiers: 片 river bank
  • - strandmudflatGobi desert