The first sentence in the article reads: "In positive psychology, flow, also known as the zone, is the mental state of operation in which a person performing an

The first sentence in the article reads: "In positive psychology, flow, also known as the zone, is the mental state of operation in which a person performing an activity is fully immersed in a feeling of energized focus, full involvement, and enjoyment in the process of the activity." Also: "Achieving flow is often colloquially referred to as being in the zone." So, yes, they are synonymous. :-)