Highest concentration of lightning

The Catatumbo Lightning occurs in Venezuela over the mouth of the Catatumbo River as it enters Lake Maracaibo. This area receives almost 250 lightning flashes per square kilometre each year. Lightning happens up to 300 nights per year in displays that can last nine hours. In 2010 the lightning ceased from January to April, possibly due to effects from the El Niño/La Niña–Southern Oscillation.