A map of the swamp, it would appear. There is some writing on it.
These appear to be some sort of directions...

            E         
            *         
            *         
            *         
             *       
             *       
             *       
             *       
            *        
           *         
           *         
            *        
            *        
          * *        
         * *         
         *           
          *          
           *         
           S         
           *         
          *