Kudarappu Survey Tower in Jaffna (යාපනයේ කුඩරප්පු මිනුම් කුළුණ)
This Trigonometrical Station is built on a square platform with 4 steps on all four sides. Four cylindrical pillars stand on the platform. The diameter of each cylinder gradually decreases as it goes higher. The Bottom cylinder is shorter than the other 3. The top 3 cylinders seem to be of the same height.