Myra Arboretum, also known as the Larimore Arboretum, is a twenty-six-acre arboretum in Larimore, North Dakota, on the south branch of the Turtle River within the Larimore Dam Recreation Area. With more than five hundred trees, it combines the qualities of a botanical collection and a riverside park landscape. In a small community, it is a distinctive garden space centered on trees and their setting along the river.