The natural barrier concept is alright provided the natural barrier is really separate the outside and the residential area. However when you look at the area near to the Semi-D or Bywater which has no complete natural barrier at all but with the connection of pedestrian way from the Semi-D area to the outside such as the bird viewing place. Outsider is easily to enter into this Setia Utama 1, Setia Utama 2 and Bywater area.  In fact, few house breaking in cases already happened in Setia Utama 1 and Setia Utama 2 due to this so called incomplete and poor natural barrier. I think the anti-fencing system is still the ultimate barrier system for totally isolating outsider from breaching into the housing area.