Greece is hoping that protected areas will help keep daytrippers away and allow vulnerable monk seals to return to their island habitats

Deep in a sea cave in Greece’s northern Sporades, a bulky shape moves in the gloom. Someone on the boat bobbing quietly on the water close by passes round a pair of binoculars and yes! – there it is. It’s a huge Mediterranean monk seal, one of the world’s rarest marine mammals , which at up to 2.8 metres and over 300kg (660lbs), is also one of the world’s largest types of seal.

Piperi, where the seal has come ashore, is a strictly guarded island in the National Marine Park of Alonissos and Northern Sporades, Greece’s largest marine protected area (MPA) and a critical breeding habitat for the seals. Only researchers are allowed within three miles of its shores, with permission from the government’s Natural Environment and Climate Change Agency.