Syanno or Senno is a town in Vitebsk Region, Belarus. It is located 58 km southwest of Vitebsk on the southern shore of Senno Lake. In 2018, i…Syanno or Senno is a town in Vitebsk Region, Belarus. It is located 58 km southwest of Vitebsk on the southern shore of Senno Lake. In 2018, its population was 7,092. As of 2024, it has a population of 7,090.