Charles H. Keating Sr. Natatorium is an indoor swimming venue on the campus of St. Xavier High School in the Finneytown neighborhood of Springfield Township, Hamilton County, Ohio, just outside Cincinnati. It is operated by the Cincinnati Marlins, a non-profit swim team affiliated with USA Swimming. The facility serves as the Marlins' headquarters and central region training facility. It is also the home training base of the St. Xavier Aquabombers swimming and diving, triathlon, and water polo teams.