Thessaloniki
Several topographic regions surround the main mountainous core and are often penetrated by extensions of it. The northernmost part, roughly the regions of Makedonía and Thráki , extends in a long, narrow, east-west band between the Aegean coast and the frontier with the countries of FYROM and Bulgaria.
It consists of forest-clad, crystalline mountain massifs and plateaus created by the fracturing of the Hercynian block and separated from each other by the alluvial deposits of the five great rivers of northern Greece: the Maritsa (Évros), Néstos, Strymónas (Struma), Vardaráis (Vardar; Axiós;), and Aliákmonos (Aliákmon).
The fracturing of the Hercynian also accounts for the odd three-pronged shape of the Chalkidikí (Chalcidice) Peninsula, on whose easternmost prong is located Mount Athos (Holy Mountain), which is the famous site of Greek Orthodox monastic communities.
Along and beyond the Bulgarian border rise the Rodópi (Rhodope) Mountains, mainly composed of sharp-edged and sloping plateaus, reaching 7,260 feet (2,213 metres) at Mount Órvilos. The Maritsa River, in its low-lying, marshy valley, marks the Turkish border.
From there to the lower Strymónas River extends a succession of plains, some of which are often swampy, such as the deltaic plain of the lower Néstos, and others have been turned into fertile agricultural land, as is the case in the former Lake Akhinós. Inland there are basins of structural origin, such as the Plain of Drámas (Drama). Lakes Koróneia (Korónia) and Vólvi, which separate the Chalkidikí Peninsula from the rest of the coastal region, also occupy structural depressions.
Farther west, the large plain drained by the Vardaráis and lower Aliákmonos rivers is being continually extended as the river deltas push out into the Gulf of Thermaïkós (Thérmai). The forested Vérmion (Vérmio) Mountains and, beyond them, the barren inland basins around Lakes Vegorítida (Vegorrítis) and Kardítsa mark the boundary with the Píndos Mountains.
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