The Ghegs (also spelled as Gegs; Gegët) are one of two major dialectal subgroups of Albanians (the other being the Tosks) They are also differentiated by minor cultural, dialectal, social and religious characteristics. The Ghegs live in Albania (north of the Shkumbin river), Kosovo, North Macedonia, Serbia and Montenegro. The Ghegs speak Gheg Albanian, one of the two main dialects of Albanian language. The social organization of the Ghegs was traditionally tribal, with several distinct tribal groups of Ghegs. The Ottoman Empire annexed and ruled the Tosk-inhabited south at the beginning of the 15th century, while the territory populated by Ghegs remained out of the reach of the regular Ottoman civil administration until the beginning of the 20th century. As a consequence, the Ghegs evolved isolated from the Tosks. Similarly, the Islamization of the Ghegs was incomplete, with a large area of northwestern Albania remaining Catholic. The Ottomans never completely subdued the northern Albanian tribes of Ghegs because they were more useful to them as a stable source of mercenaries. Instead, they implemented the bayraktar system, and granted some privileges to the bayraktars (banner chiefs) in exchange for their obligation to mobilize local fighters to support military actions of the Ottoman forces. Proper Gegnia (the land of the Gegë) is located north of the Shkumbin river along its right bank and extends up to modern border between Mat and Mirdita, where Leknia begins. Leknia itself is bordered to the north by Malësia. None of these regions overlap with one another and each has its own self-identification. This is reflected in the fact that only the people of proper Gegnia call themselves Gegë, while moving northwards it is not a form of regional self-identification. For example, the people of the Dukagjin highlands when asked about their regional appellation would reply na nuk jemi gegë, gegët janë përtej maleve (we are not Gheghs, the Ghegs live beyond the mountains).