Rebecca Gill, from the Bicester-based Blue Fins Tristars, was crowned champion at the final round of the British Triathlon Association Southern Regional Series at Thruxton Race Circuit.
She took the honours in the 13/14 year girls' section at the Thruxton Row Triathlon to capture the overall title, with clubmates Bethaney Harrison and Charlotte Landy fourth and fifth respectively on the day.
Gill gained representative honours recently when she helped the Southern region finish seventh in the Inter-Regional Championships at Loughborough University.
At 11/12 years, Claire Hopkins's fourth place earned her third spot overall in her first season.
In the boys' competition, Christopher Gill produced a fine effort to finish second on the day.
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