**2. Methods: A Systematic Review**

There are many kinds of literature review and the type of review should be appropriate for the subject and goal at hand [36]. In this case, we conducted a systematic review as there has, to the best of our knowledge been no review on urban greenways, yet greenways are common in urban areas and there is a sizable scholarly literature on this topic. As such, a systematic review is appropriate because it helps to clarify the state of existing research and associated implications for future research [38]. In structuring the methodology of this review, we drew upon systematic review precedents in urban greening and landscape planning [35,39].

We searched for the terms "urban greenway" and "urban greenways" through 2018 within the title, keywords, or abstract of three databases: *Web of Science*, *ScienceDirect*, and *Avery Index to Architectural Periodicals.* We then eliminated overlapping results across these database searches. From this pool, we focused on peer-reviewed journal articles and eliminated sources including presentations, posters, book reviews, edited book volumes, magazine articles, encyclopedias, and conference proceedings. This yielded 52 total sources.

We then systematically reviewed these articles across seven categories (see Table 1 and Addendum 1 for the full data set). Most of these (categories 1–5) are based upon precedents in related reviews. But to discern some of the qualities that distinguish urban greenways as a distinct type of landscape form and planning practice, we added two categories: "extent" and "landscape setting." Extent refers to the area covered by the greenway under study, and we use the following classification: *urban center* (within a municipal boundary); *metropolitan* (suburban area surrounding an urban center); *rural* (beyond an urban or suburban area); *multi-scalar* (a corridor or network that crosses some combination of urban, metropolitan, or rural areas); and *multiple sites* (studies that examined more than one greenway in different locations).

