Taking the entire globe, if North America and Western Europe can be called the 'cities of the world', then Asia, Africa and Latin America constitute 'the rural areas of the world'.
Bio: Billie Jean King is an American former World No. 1 professional tennis player. King won 39 Grand Slam titles, including 12 singles, 16 women's doubles, and 11 mixed doubles titles. King won the singles title at the inaugural WTA Tour Championships.