Пятно Чингисхана -https://ru.wikipedia.org/wiki/%D0%9C%D0%BE%D0%BD%D0%B3%D0%BE%D0%BB%D1%8C%D1%81%D0%BA%D0%BE%D0%B5_%D0%BF%D1%8F%D1%82%D0%BD%D0%BE