The Detroit River is a central figure in the narrative of "When Our Fathers Return to Us as Birds," serving as a backdrop and a symbol for themes of loss, memory, and connection. It's a site of reflection and mourning, where the protagonist, Peter Markus, seeks solace and meaning after his father's death. The river's presence is felt throughout the book, from the description of its natural beauty to its industrial past, reflecting the complex relationship between human life and the natural world. It also symbolizes the passage of time and the cycle of life, as seen in the migration of birds and the changing seasons. The river's dual nature—both a source of life and a witness to industrial decay—underscores the themes of transformation, resilience, and the enduring bond between father and son.