It connects Tripoli with Sparti and Gytheio. It is connected with the GR-7 (Corinth - Kalamata) in Tripoli, with the Moreas Motorway (Corinth - Kalamata) south of Tripoli, with the GR-82 (Pylos - Kalamata - Sparti) in Sparti, and with the GR-86 (Krokees - Monemvasia) in Krokees. The GR 39 coincides with the European route E961 for most of its length.