Most people performing a synchronised swimming routine

According to Official Guinness Records,

The most people performing a synchronized swimming routine is 247, organized by Elena Martinez (Spain) in Ávila, Spain, on 08 August 2017. This record took place to celebrate 50 years of the Urbanización Coto de Puenteviejo.

For a complete list of 2017 records, please visit 2017 Guinness Records in Spain.

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Other Spain records that might interest you:

• Shortest charging time to cross Europe (Nordkapp, Norway to Tarifa, Spain) in an electric vehicle
• Longest line of fanfare trumpeters (valved trumpets)
• Largest transforming human image
• Tallest drinking glass pyramid
• Most wins of the football (soccer) European Cup / Champions League (team)