The interpretation of seeing a delta of a river in a dream is related to one end to something in waking life. This may relate to a personal or spiritual path. Alternatively, the dream may have the same symbolism as a triangle.
You may look in dreams interpretation for other symbols :
Dementia : The interpretation of dreaming that you or someone else has dementia is that there is a situation in waking life that makes you lose your mind. Maybe someone ... html">
Demolition : The interpretation of dreaming about a demolition is that that major changes are ongoing in your life. Maybe you feel like you lose everything under control. ...