Regional details refer to elements that are specific to a particular region or area. Synonyms for this phrase could include local features, regional characteristics, area-specific traits, or geographically unique factors. Other options might include location-specific details, territorial particulars, regional distinctions, or provincial nuances. Essentially, any phrase that conveys the idea of traits or details that are distinctive to a certain area can serve as a synonym for regional details. Whether you're describing geographic features, cultural elements, or socioeconomic factors, there are numerous ways to capture the essence of this concept and convey it effectively to your audience.