India will host the world's biggest election this year when nearly one billion people will vote. Organisers have vowed to set up polling stations within 2km of every citizen, but India's vast size means this will be a challenge. The country's 15 million election officials must travel to coastal towns, mountain villages, remote islands and dense jungles to reach every voter.

Katya speaks with BBC journalist and presenter Devina Gupta and India correspondent Soutik Biswas to break down the big numbers and discuss how it is possible to organise an election on this scale.

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This episode was made by Alice Aylett Roberts and Devina Gupta. The technical producers were Hannah Montgomery and Mike Regaard. The assistant editor is Sergi Forcada Freixas and the senior news editor is Sam Bonham.