In myth a river separates the living from the dead, and dream books read it as a boundary that marks a real ending. Lethe, the river of forgetting, adds the theme of letting memories go.
Does the traditional reading fit your dream, or did it mean something else to you?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.