The two health trusts describe the merger as an "exciting development"
Two NHS trusts controlling health services in north Wales have been given the go-ahead to merge.
The new North Wales NHS Trust will take over from the current Conwy and Denbighshire and North East Wales NHS trusts in July.
The merger will bring more than 11,000 staff together under the same managers to provide health services for over 520,000 people.
The North West Wales NHS Trust is not included in the merger plans.
Alun Lewis, the current acting chair of the Conwy and Denbighshire trust, said he was delighted to be joining colleagues in the east.
"I believe that together we have the experience, skills and commitment to develop services for patients which are fit for the 21st Century," he added.
Michael Williams, chair of the North East Wales trust, said he saw the merger as a way to "share our strengths and expertise for the benefit of patients".
"The merger opens up new opportunities for us to develop services, raise standards and further reduce waiting times," he added.