When enter the morphographic objects, I have presented for further use as additional data the respective region and sub-region, as well as the physical geographic area. For the sake of convenience, I combine two different zoning systems – Ivanov Zones – most popular since 1968 and Penin Region system from 2007 and became a great mess… Because the zones are 5 (see below), and according to the new division of the country, it consists of 9 regions – Danube plane (1) Prebalkan (Fore)(2), Balkan Mountains (3), Balkan valleys (4), Srednogorie (Sredna Gora)(5), Kraishte (6 ), Rila-Rhodope massif (7), Thracian-Strandzha region (8) and the Black Sea (9).
Most Regions are divided into sub-regions, such as the Danube Plain (1), Prebalkan (Fore ) (2) and Stara Planina (3) are divided into Western (-1), Middle (-.2), and Eastern (-3) often with boundary rivers. Balkan valleys (4) are two sub-regions – Western – High (4.1) and East – Low (4.2). Srednogorie (Sredna Gora) and Kraishte have more complex zoning.
Srednogorie (Sredna Gora)(5) as a physiographic region is divided to the west, the central and the eastern, as the East Srednogorie is the Zavalo-Plana mountain range (from Serbian border to the Iskar River), Central Srednogorie is a Sredna Gora Mountain, while the eastern Srednogorie is the height of the Bakardzicite and Hissar. Here comes the confusion as Sredna Gora mountain itself is divided into the same sub-regions, and for the Mountain is often used term Srednogorie. But Western Sredna Gora is in this case is Ihtiman Sredna Gora from Iskar to Topolnitsa River, Central Sredna Gora is Sashtinska Sredna Gora (from Topolnitsa to Stryama river) and Eastern is Sarnena Sredna Gora (between rivers Stryama and Tundja ).
The Kraishte (6) is divided by alternating mountain ranges and valleys, which is more “inner” than purely geographic (west-east or north-south), as the mountains and valleys flow into each other. An interesting detail that came up at the last moment is that the Kamenishko-Dupnitsa valley, in fact, continues and covers the Samokov and Dolna banya fields. For the Samokov field only notes is that it’s in Kraishte, without mentioning a sub-region, and Dolna banya field in 98% of the publications is given in Srednogorie as part of Ihtiman Sredna Gora. And indeed the two fields stand like a patch of Kraishte, and most likely, the people living in them do not see the connection between them and the Kyustendil or Pernik … But we still talk about physiographic areas.
The Rila-Rhodope massif (area) (7) is divided into 4 sub-regions, depending on the included mountains. Osogovo-Belasitsa mountain range (7.1) includes mountains along the border with Macedonia (Ossogovo, Vlahina, Malashevska and Ograzhden Mountains), the valleys of Struma and Strumeshnitsa and three border Belasitsa Mountain. The Rila-Pirin region (7.2), besides the two mountains, includes the Mesta river valley, and the Rhodope Mountains are divided into the Western Rhodopes (7.3) and the Eastern Rhodopes (7.4)
Thracian-Strandja region (8) is divided into a morphological sign – on Thracian-Tundzha sub-region (8.1), comprising the Upper Thracian, Tundja and Burgas valleys, and Sakar-Strandja sub-region (8.2) with a Strandja, Sakar and surrounding heights.
The Black Sea (9) is divided into three parts – North (9.1), Middle (9.2) and South (9.3), and although the boundaries between the three are clear, the morphographic objects included in them are not clear. The Dobrudzha or Frangel Plateau are part of the Danube Plain, but they are part and from the Northern Black Sea coast. Stara Planina mountains alongside the coast (Kamchiyska, Eminska, Aitoska) are the Balkan Mountains, but some part of them (unclear which) is actually the Middle coast. The Burgas lowland is part of the Thracian-Tundzha sub-region, but also the base of the Southern Black Sea coast. To the Southern Black Sea coast are also the Strandja ridges descending to the sea, otherwise part of the mountain itself, which is in another region.
Zoning in five zones seems to be simpler, but not quite. The zones are as follows – Danube plane (1) overlapping with the Region, the Balkan zone (2) – which unites in itself Bredbalkan (Fore), Balkan Mountains, Balkan valleys and Srednogorie, Kraishte – Tundzha zone (3) connects Kraishte with portion of Thracian-Strandja region. Kraishte – Tundzha zone, to be one, includes parts of the Srednogorie, such as Shipochan ridge and Shumnatitsa (or at least the saddles between them and Rila), Sheep hills, Chirpan hills and others. To the south, the Haskovo hills that are part of the Rhodope Mountains are also part of the Kraishte-Tundzha zone. To the east, the area includes the Yambol and Elhovo fields and Sakar, but without the Strandzha and the Bourgas valley leading to the Black Sea zone (5). The Black Sea zone (quite wide and inland that the Black Sea region) also includes Dobrudja, but Dobrudja land itself reaches Silistra and Isperih, so I do not know …
But GIS file with the morphological units is available and the map can be use for consulting. Based on it, additions and upgrades will be made for future projects. File is working and will not be released for download, but if desired may be given access to the Dropbox folder for cooperation project.