A €15m sea pool on the River Liffey is being planned by Dublin City Council.
It is hoped that the new facility will be sited beside the Sean O'Casey bridge near the planned Whitewater Rafting Centre.
Plans have been sent to councillors proposing that the centrepiece of the Sea Pool would be a 50-metre heated outdoor swimming pool, alongside sauna, yoga, cafe and corporate meeting facilities.
In a report, Docklands Manger Derek Kelly said an international competition could be held to find a company to design, build and operate the facility on Custom House Quay for a lease with a possible time period of 30 years.
It is estimated that it would cost visitors €10 for a two-hour visit with concessions for older citizens, families and members.
It would be modelled on the Allas Spa complex in Helsinki that gets 800,000 visitors annually and it is estimated that the Dublin facility could generate over €100m in revenue over the course of its lease.
A wooden structure on a modified steel barge either floating or on fixed piles is being proposed.
The report states that this would create a "cluster" of visitor attractions being sited near the whitewater rafting centre, the Jeanie Johnston and The EPIC Diaspora Museum.
Labour councillor and chair of the South East Area Committee Dermot Lacey said the idea is welcome, but there are questions about the effect on traffic on the quays, the financial liability and the length of the lease.
Meanwhile, the city council's design team for the white-water rafting centre on Georges Dock is hoping to be ready to advertise a works contract on eTenders during the last quarter of the year.