Individual #Baltic_Sea__Baltic  a sea in northern Europe; stronghold of the Russian navy
  instance of:  #sea
  part:  #Gulf_of_Bothnia  a northern arm of the Baltic Sea; between Sweden and Finland
     part:  #Aland_islands__Aaland_islands__Ahvenanmaa  an archipelago of some 6,000 islands in the Gulf of Bothnia under Finnish control
  part:  #Gulf_of_Finland  an eastern arm of the Baltic Sea; between Finland and Estonia

No statement uses or specializes #Baltic_Sea; click here to add one.