What are these blue lines around the runway at the airport chart that I marked with red lines? They are not waterways or taxiways so what are they?

Yenisehir Airport (LTBR): enter image description here

Adana International Airport (LTAF): enter image description here

  • 1
    $\begingroup$ what airport is this? $\endgroup$
    – user22445
    Oct 7, 2022 at 14:55
  • $\begingroup$ Adana International Airport and Yenisehir Airport from Turkey. I've seen these blue lines several times on different charts. LTAF and LTBR btw. $\endgroup$
    – pilot162
    Oct 7, 2022 at 15:02
  • 1
    $\begingroup$ And this is why you have to look out the windows when flying IFR. A glance a reality can tell you what charts & instruments won't. $\endgroup$
    – FreeMan
    Oct 7, 2022 at 16:25

1 Answer 1


They are in fact waterways: irrigation ditches or channels. The Jeppesen airport chart legend lists them as

32 — Ditches in the vicinity of the airport are depicted.

For example, looking at a Google Maps view of LTBR, the blue line charted west of the runways clearly refers to the Kurutma Kanali/Marmaracık Gölü Kurutma Kanali. The blue lines between the runways are not shown on the Google Maps terrain/relief view, but switching to the aerial imagery view reveals a drainage ditch on either side of Runway 07L. In fact there appears to be another one which Jeppesen does not depict on the south side of Runway 07R.

  • $\begingroup$ Thank you so much for your answer. Actually, the reason why I asked the question was the blue line between the runways, because there was nothing like a waterway between the runways while flying at that airport. But as a result, as you said, it becomes clearer when you check it from Google maps. $\endgroup$
    – pilot162
    Oct 7, 2022 at 18:00

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .