- Make it difficult for unauthorised people to enter without being spotted, trapped, intercepted, or killed
- Prevent intruder from escaping easily
- Trees, dense brush, and hedges can provide cover for sensors, wires, cameras, tiger pits, secret entrances or exits, or automated gun systems
- Ponds and lakes
- Dense brush and ground cover difficult to bypass without creating noise and may be paired with acoustic sensors
- Foliage affects Matrix Noise