Eternal Tears of Sorrow (commonly abbreviated to ETOS) is a Finnish melodic death metal band formed in Pudasjärvi in Northern Ostrobothnia, Finland. Romantic lyrics and soft keyboard melodies show gothic metal influence.

Children of the Dark Waters is the sixth studio album by Finnish band Eternal Tears of Sorrow. The album will be in the same vein as Before the Bleeding Sun, but darker. Children of the Dark Waters (Act II) is the second part of Angelheart, Ravenheart (Act I: Before the Bleeding Sun) from Before the Bleeding Sun.

The album's first single Tears of Autumn Rain featured female vocals by Miriam Renvåg (Ram-Zet) and Heidi Parviainen (Amberian Dawn). The B-side of the single is a reworked version of Vilda Mánnu from the self-titled album, Vilda Mánnu. The album was mixed at Finnvox Studios (Helsinki, Finland) in March and April 2009 by Mikko Karmila and like the previous five albums, it was recorded at Tico-Tico Studios in Kemi.