Around 2,000 migrants on Lesvos, including hundreds of small children, are living in tents that were set up during the summer amid concerns that the onset of winter may bring a new humanitarian crisis on the island.
In total, there are 8,293 people on the island, a favored destination of people traffickers bringing migrants over from neighboring Turkey.
Conditions are similarly overcrowded on Samos where 2,397 people are cramped in and around a facility built to hold 700.
Meanwhile arrivals from Turkey continue, dozens every day.
On Monday another 101 migrants landed on the islands of the eastern Aegean while more than 400 arrived over the weekend.
The continued influx are leading to rising tensions both in the camps and amid the local communities on the islands.