The silhouette on the horizon is the island of Farmakonisi where many refugees and migrants land after crossing from Turkey. It is 5½ miles from the coast of Turkey and 12 miles from Leros.
Farmakonisi is a Greek military island and access is restricted. Once the refugees land the Greek Army calls the Coast Guard to come and collect them but sometimes it takes days in an island that has no shelters or any kind of infrastructure to host people.