There's a 15km2 "Zone of Silence" in Mexico - Apparently.
The Mapimí Silent Zone, also known as the Mapimí Gap, is a region in northern Mexico where radio signals are reportedly disrupted or cancelled out. It's located in the state of Durango, near the US-Mexico border. The phenomenon has been observed and studied by scientists since the 1930s, who have attempted to explain it through various theories, including changes in the Earth's magnetic field and unusual atmospheric conditions. Despite the lack of concrete explanation, the Zone of Silence remains a fascinating and unexplained feature on the map.