The Subbalkan dialect is a Bulgarian dialect, which is part of the Balkan group of the Eastern Bulgarian dialects. Its range includes the northeastern part of Bulgarian Thrace, i.e. the regions of Burgas, Sliven, Yambol, Stara Zagora and Chirpan. As a result of the mass population movements that affected eastern Bulgaria during the 19th and the beginning of the 20th century, speakers of the Subbalkan dialect have moved en masse to northeastern Bulgaria and now form a vast portion of the population of the districts of Varna, Dobrich and Balchik. Some of these also went as far as Bessarabia establishing numerous colonies there. Nowadays, a large part of the Bessarabian Bulgarians speak this dialect. The most significant feature of the Subbalkan dialect, as in all Balkan dialects, is the pronunciation of Old Church Slavonic ѣ (yat) as ʲa or ɛ, depending on the character of the following syllable.