In 2005, the organisers released a provisional list of thirteen venues to be used for the World Cup: Bloemfontein, Cape Town, Durban, Johannesburg (two venues), Kimberley, Klerksdorp, Nelspruit, Orkney, Polokwane, Port Elizabeth, Pretoria, and Rustenburg. This was narrowed down to the ten venues that were officially announced by FIFA on 17 March 2006. The altitude of several venues affected the motion of the ball and player performance,although FIFA’s medical chief downplayed this consideration.Six of the ten venues were over 1200m above sea level, with the two Johannesburg stadiums (Soccer City and Ellis Park) the highest at approximately 1750m. The stadiums in order of altitude are: Soccer City and Ellis Park Stadium, 1753m; Royal Bafokeng Stadium, 1500m; Free State Stadium, 1400m; Peter Mokaba Stadium, 1310m; Loftus Versfeld Stadium, 1214m; Mbombela Stadium, 660m; Cape Town Stadium, Moses Mabhida Stadium and Nelson Mandela Bay Stadium near sea level.