Where does Dana find herself when she regains consciousness?

The first time that Dana travels through time, she wakes up near a river. It is 1815, and Dana is an African-American woman in the Southern United States. She comes upon a young, white boy drowning in the river. She pulls him out of the water and performs CPR to save his life.
Over the course of the novel, Dana encounters the boy at various points of time in his life. The boy is none other than Rufus Weylin, Dana's great-great-great-great grandfather. Dana never knew that he was white, and meeting him and her great-great-great-great grandmother in the past offers her the opportunity to learn about her ancestors. Furthermore, Dana saves Rufus's life more than once, ensuring her own existence in the future.