Borders On is a term used to describe the relationship between two entities, such as countries, states, or provinces. The term can also be used to describe the relationship between two physical features, such as rivers or mountains. The two crossword solutions for this term are ABUTS (5 letters) and VERGES (6 letters). ABUTS means to touch or adjoin something, while Verges means to approach or come close to something. Therefore, both of these words describe the same concept of two entities or features being in close proximity to each other.