A further important consideration for the allies was the obscurity of the ethnographi.c lines in central Macedonia.
Serbia, on her side, had to consider not only central Macedonia but northern Macedonia and the Sanjak of Novibazar.
The principal summits are Olympus overlooking the Gulf of Salonica; Musalla (9631) and Popova Shapka (8855), both in the Rhodope system; Liubotrn in the Shar Dagh (8989); Elin, in the Perin Planina (8794); Belmeken in southern Bulgaria (chain of Dospat, 8562); Smolika in the Pindus range (8445); Dormitor in northern Montenegro (8294); Kaimakchalan in central Macedonia (8255); and Kiona in Aetolia (8235).
