PSARADES, Greece (AP) — Greece and Macedonia are about to sign a deal that, if ratified, will resolve a decades-old dispute concerning Macedonia's name.

The two countries' prime ministers, Greece's Alexis Tsipras and Macedonia's Zoran Zaev, will attend the signing of the deal Sunday by the two countries' foreign ministers, along with U.N. and EU officials.

The village of Psarades, on the shore of the Great Prespa lake, was chosen as a symbolic site, since it lies near where the borders of the two countries, as well as Albania, meet.

Zaev is to arrive by boat from across the lake, to be greeted by Tsipras.

Police have cordoned off all approaches to the village to prevent protesters from reaching the site. A protest by nationalists will be staged almost 40 kilometers (25 miles) away.