A naked man has been arrested after showering in a fountain at a busy Christchurch children's playground.

Police received several calls to Margaret Mahy playground in Christchurch city centre just after 11am yesterday.

The 49-year-old man had stripped naked and was washing in a fountain, Senior Sergeant Vaughn Lapslie said.

The $3m park, which opened in December, was "reasonably busy" with families and children at the time, police say.

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The man was referred to mental health agencies.