In Haruki Murakami's "South of the Border, West of the Sun," the theme of nostalgia unfolds as the protagonist grapples with loss and memory. The reflection on a past relationship reveals that while the person is physically absent, they continue to exist vividly in the narrator's memories. This sense of longing highlights how the absence of commitment leads to a profound emotional void, emphasizing the finality of their separation.

The narrative suggests that true connection requires dedication, and where such commitment is lacking, no reconciliation or middle ground is possible. The imagery of geographical limits metaphorically represents the boundaries of human relationships, where perhaps a different reality exists, yet remains unreachable. This poignant exploration of love and lost opportunities resonates throughout the novel.