Neptune represents oneness, unity, unlimited boundaries, and the element of water.Neptune is the last of the gas giants in our solar system. According to astrology, Neptune rules all that lies below the surface—and the watery flow of creativity. At nearly 2.8 billion miles away from the Sun, we need a telescope just to get a glimpse of Neptune. Like its neighbors Uranus and Pluto, it governs invisible aspects of the personality—particularly the subconscious mind: dreams, fantasies and even delusions.