The number of places at refugee reception centres is to be increased by 100,000 in a bid to cope with the migration crisis facing Europe.
The measure forms part of a plan hammered out by European leaders aimed at managing the influx of migrants through the Balkans as winter looms and the weather turns colder.
Greece has committed to opening enough reception centres to house 30,000 refugees by the end of the year, with the United Nations providing a further 20,000 places in the country.
The rest will be created in countries to the north along the route to Germany.
European Commission president Jean-Claude Juncker said: "The immediate imperative is to provide shelter.
"It cannot be that in the Europe of 2015 people are left to fend for themselves, sleeping in fields."
The summit also agreed to tighten controls on the Greek-Macedonian border to ensure