The black lake of memory?
She had heard, correction, read this certain word somewhere. It didn't take her long to remember that she had read about the black lake of memory not just in her history book but in the story of Thabit and Nefreti as well. It was given the name 'The lake of lovers' afterwards because according to the history books, it was the last spot where Thabit and Nefreti were seen for the last time.
It was never solved what actually happened to them and she didn't even get to read the last volume of the book as the pages were destroyed. Did the cursed lake ate them like it was being passed on or was it just a tale knitted up by the people. Maybe they never went to the lake.