I need help loosing weight?!?!

I am very over weight I weight about 230 and am 5 foot 4 and I love to swim and just went swimming today at a lake for 3 hours and I swim a lot and it seems I don't lose weight I ride bikes about 2 hours every 2 days or so and I eat around 1300 calories I don't really know how much I need to eat but i just need so pointers thanks

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