Crossword Clue:

A corresponding line on a map

AnswerCrossword Clue
ARCMany a line on a flight route map
BORDERLine on a map
ROADLine on a map
HWYLine on a map: Abbr.
TRAILLine on a forest map
RTELine on a map: Abbr.
ISOBARLine on a weather map
ISOTHERMLine on a weather map showing equal temperatures