Geographical elements and Morphology. Alonnisos is a Greek island. It is in the central NW Aegean Sea above Evoia and East of Pilio, and it belongs to the island complex of Sporades.
Alonnisos , together with Skiathos, Skopelos anad Skyros, make up the island complex of Northern Sporades (administratively Skyros belongs to Central Greece, while the other Northern Sporades belong to the region of Thessalia).
Alonnisos, with a total area of 64.5 sq. km., with a coastline that reaches about 67 km, a maximum length (NE - SW) of about 20 km and width (W - E) between 2 km and 5 km, is the second in size Northern Sporades island in the province of Skopelos [excluding Skyros (area of 210 sq. km) which is the largest in area)] , larger than Skiathos (with an area of 48 sq. km) and smaller than Skopelos (with an area of 96 sq. km).
It is separated from Skopelos to the south-west by the Alonnissos strait (and the islands of Ai Giorgis and Mikros Ai Giorgis), with a breadth of 2 n.m. and to the north-east from the island Pelagonissi (Kyra Panagia) with the 3.5 n.m. strait of Pelagonissi.
Morphologically, the island which develops on a NE - SW axis, is separated into a narrower northern side due to the mountains and a southern smoother and more lowland zone.
The highest peak is mountain Kouvouli (476 m.) and hills Geladara (456 m.), Kalovoulos (355 m.), Vouno (255 m.) which together with those of Skopelos are in essence a sequence of mountainous and semi-mountainous parts that make it difficult to distinguish where the coastlines of the islands begin and end (this is apparent mainly in the SW and northern part of Alonnisos).
The main bulk of Alonnisos is made up of limestone, but to the south-west there are also Modern Tertiary lacustrine deposits, which are also covered by limestone, on which conglomerates often settle, covered by reddish Pontus loam.
This ascertainment explains the presence of Paleolithic stations along a plain strip of Alonnisos and abundant game. The rocks give Alonnisos a truly special character.
Limestone dominates. The main feature of the area’s image is cliffs down to the sea and caves, which are the main habitat of the Mediterranean seal. Various soil types are found. Fresh water is generally limited in the region.
In the southern part, which is flat, one finds the villages of Patitiri, Roussoum, Votsi, Palio Chorio high on the hill, while on the wild and rocky northern coasts there are small beaches and caves where seals, shags, seagulls and wild pigeons. Also, there are wild goats on the island and the surrounding islets, which are often seen resting in hiking kiosks!
The northern and western side of the island has a wild beauty, with rugged coasts exposed to the winds, with half the island piney and the other half even more rocky and wild. However, along the coastline there are wonderful coasts with the best known beaches Gyalia, Tsoukalia and many more (you will see the beaches analytically in the section on beaches).
This side also hosts one of the most majestic parts of Alonnissos, the chapel of Agioi Anargyroi and the beach with the same name, adjacent to Tourkoneri and Megali Ammos beaches.
The southern and eastern side is smooth with the same morphology, and it creates many wonderful beaches with small and larger pebbles, mainly ochre and white, truly majestic, but also sandy beaches (e.g. Chryssi Milia), protected as much as possible from the winds by the neighbouring island of Peristera (or Xiro), the island well-known for the best preserved and worthy classic shipwreck of antiquity.