Sentence:  ... it is most probable to be the Port of "Trapezonment", plac'd in a Corner of the "Euxine Sea;" for from this Port, within a few Months, "Anno 1272". they came to "Ancona", which could not be perform'd from the Caspian Sea, by reason of the great space of Land and Regions <WSD>interjoin'd</WSD>. 
Meaning of the word marked with <WSD> tags:  To join mutually; to unite.