Hundreds of mentally ill patients in Lancashire were treated many miles from home because of a lack of beds. This resulted in a report.
The NHS Trust report from the Lancashire Foundation Care also found that patients who spent days in A & E were waiting for a bed while others were in a waiting room.
Dr. Amanda Doyle, the chief health officer who commissioned the report, said she had "abandoned people".
The Care Trust said it regretted that its services had "come up short".
Dr. Doyle, Chief Officer of Healthier Lancashire's Integrated Care System and South Cumbria, the Lancashire health care umbrella organization, said, "We're not here to make excuses.
"We knew we would let people down, but what we learned is some of the underlying issues that contributed to it."
The report shows how patients can be stranded for days in emergency rooms or held in small storage rooms because there are no beds available.
One man told the BBC how he spent days sitting in a chair in A & E with his son on a bed in The Harbor, a psychiatric special unit in Blackpool.
The Northumberland, Tyne and Wear NHS Foundation Trust report found that some patients were taken to other hospitals far from home, sometimes hundreds of miles away.
It turned out that this had occurred more than 17,000 times in the last 12 months – a third of all cases in northern England.
Caroline Donovan, managing director of the Lancashire Care NHS Foundation Trust, welcomed the report "although it is very hard to read".
"We are so sorry that in many cases our services have fallen far short of our expectations," she said.
"I will personally manage the improvement program, and the work has already begun."
The trust was criticized in 2017 for his mental health service in Liverpool Prison, which was closed in April last year.
Earlier this year, a Blackpool Council official raised concerns about the extent of the attacks at a trust-run hospital.