Tree lineThe tree line is the edge of the habitat at which trees are capable of growing. It is found at high elevations and high latitudes. Beyond the tree line, trees cannot tolerate the environmental conditions (usually low temperatures, extreme snowpack, or associated lack of available moisture). The tree line is sometimes distinguished from a lower timberline, which is the line below which trees form a forest with a closed canopy. At the tree line, tree growth is often sparse, stunted, and deformed by wind and cold.
Blagoevgrad ProvinceBlagoevgrad Province (област Благоевград, oblast Blagoevgrad or Благоевградска област, Blagoevgradska oblast), also known as Pirin Macedonia or Bulgarian Macedonia (Пиринска Македония; Българска Македония), (Pirinska Makedoniya or Bulgarska Makedoniya) is a province (oblast) of southwestern Bulgaria. It borders four other Bulgarian provinces to the north and east, the Greek region of Macedonia to the south, and North Macedonia to the west. The province has 14 municipalities with 12 towns.
AromaniansThe Aromanians (Armãnji, Rrãmãnji) are an ethnic group native to the southern Balkans who speak Aromanian, an Eastern Romance language. They traditionally live in central and southern Albania, south-western Bulgaria, northern and central Greece and North Macedonia, and can currently be found in central and southern Albania, south-western Bulgaria, south-western and eastern North Macedonia, northern and central Greece, southern Serbia and south-eastern Romania (Northern Dobruja).
Mountain rangeA mountain range or hill range is a series of mountains or hills arranged in a line and connected by high ground. A mountain system or mountain belt is a group of mountain ranges with similarity in form, structure, and alignment that have arisen from the same cause, usually an orogeny. Mountain ranges are formed by a variety of geological processes, but most of the significant ones on Earth are the result of plate tectonics. Mountain ranges are also found on many planetary mass objects in the Solar System and are likely a feature of most terrestrial planets.
GlacierA glacier (USpronˈɡleɪʃər; UKˈɡlæsiər,_ˈgleɪsiər) is a persistent body of dense ice that is constantly moving under its own weight. A glacier forms where the accumulation of snow exceeds its ablation over many years, often centuries. It acquires distinguishing features, such as crevasses and seracs, as it slowly flows and deforms under stresses induced by its weight. As it moves, it abrades rock and debris from its substrate to create landforms such as cirques, moraines, or fjords.
ValleyA valley is an elongated low area often running between hills or mountains, which will typically contain a river or stream running from one end to the other. Most valleys are formed by erosion of the land surface by rivers or streams over a very long period. Some valleys are formed through erosion by glacial ice. These glaciers may remain present in valleys in high mountains or polar areas. At lower latitudes and altitudes, these glacially formed valleys may have been created or enlarged during ice ages but now are ice-free and occupied by streams or rivers.
