Sounds ideal for a bog garden. Make sure that water / soil from the two don't intermingle, as you need low fertility in the pond & quite high in the bog garden. Depending on your soil, you will need to make perforations in the bog garden liner, so that it never fills up & overflows, but drains very slowly. In a clay soil you will need quite a few holes, in sandy soil, one thrust of the garden fork will probably suffice.
If it can be sited near to the beach area of the pond, you will find that all sorts of small wildlife take refuge in the bog garden plants before going down to drink or wash.
JeremyB