More than 6,500 people are living in facilities made to accomodate just over 2,300 in Lesbos. "There are large numbers of people who are living in inhumane conditions," Mayor Spyros Galinos says.
Greek islanders protested on Tuesday in Athens outside Greece's Ministry for Migration over the increasingly precarious, overcrowded conditions faced by newly-arriving migrants and refugees.
The mayors of the islands of Lesbos, Chios and Samos, along with dozens of residents, travelled to the mainland to demand the government take measures to reduce overcrowding.
"There are large numbers of people who are living in inhumane conditions, in appalling conditions, dangerous conditions," Lesbos Mayor Spyros Galinos said, explaining why he wants the number of migrants on his island reduced. "And at the same time the social cohesion on our islands is in danger."
Under a European Union-Turkey deal reached last year to reduce the number of migrants coming in, those arriving on Greek islands from the Turkish coast are held in camps on the islands and face deportation back to Turkey unless they successfully apply for asylum in Greece.
The lengthy process has led to severe overcrowding. On Lesbos, about 6,500 people are stuck in facilities designed for just over 2,300.
"There is no room, there is no solution with this policy," said Galinos. "If we don't react now ... the problem will continue to grow. At some point, the bubble will burst and things will be completely unmanageable."
Human rights groups have also repeatedly voiced concerns over the conditions on the islands, especially in winter.
Authorities have been moving hundreds of migrants deemed to be vulnerable from the island to camps on the mainland. But with more people arriving, the move has not relieved pressure on the overcrowded facilities on the islands.
Michalis Angelopoulos, mayor of the small island of Samos, whose permanent population numbers roughly 6,500, described the situation as "critical." He said there were 3,172 refugees or migrants on Samos, which has facilities for 800.
The Greek government says it cannot move all those who arrive on the eastern Aegean islands because to do so would violate the EU-Turkey deal. But the mayors reject the argument.
Greece and the EU must "take real measures and enforce real policies," said Chios mayor Manolis Vournous. "If a policy is not operating or it is working only at the expense of the island and at the expense of the refugees, it is not a real policy."