Aspropotamos–Spercheios line
The Aspropotamos–Spercheios line or Achelöos–Spercheios line was Greece's first land border with the Ottoman Empire, established by the London Protocol.
The border was decided upon by the three Great Powers. It would start at the mouth of the Achelous River, pass through Artotina along the ridge of Mount Oeta and reach the Malian Gulf at the mouth of the Spercheios River, passing south of the city of Zitouni, which would remain in Ottoman hands. The island of Euboea, the Northern Sporades, Skyros, and the Cyclades including the island of Amorgos would become part of Greece.
It was replaced in the Treaty of Constantinople by the Ambracian Gulf – Pagasetic Gulf line, which had already been envisaged in the London Protocol as the northern boundary of an autonomous Greek state under Ottoman suzerainty.
