THE WESTERN AQUEDUCT OF NICOPOLIS AD ISTRUM (Ivan Tsarov – tsarov@abv.bg) A sector of the water-conduit (specus) of the main western aqueduct of Nicopolis ad Istrum was discovered on the border between the lands of Village of Resen and Village of Nikyup. It was traced out at 182 m in length. A sondage was carried out. The water-conduit of the aqueduct was built inside a trench. Part of its vault was destroyed. The vault was constructed of stones bonded with mortar and was 28 – 30 cm thick. A shuttering was used in its construction. The walls of the aqueduct were built of stone slabs bonded with mortar and its bottom had a trapezoidal cross-section. Traces from limescale were documented up to 20 cm above the bottom.