Shan Hills

The Shan Hills, also called the Shan Highland, are a vast mountainous zone in Southeast Asia. This region stretches through Yunnan in China, into Myanmar, and across into Thailand. The landscape is not a single flat surface. Instead, it is a complex system of numerous peaks. These peaks are mostly separated by narrow valleys. There are also a few broader intermontane basins, which are plains located between mountains. The mountain ranges here are aligned in a specific way. They connect to the foothills of the Himalayas to the northwest.

Geologically, the Shan Hills have a very interesting structure. In the hills and their southern subranges, layers of alluvium sit on top of hard rock. Alluvium is a term for material like sand or clay that is deposited by water. Large parts of the hills consist of limestone. This creates karstic ranges, which are landscapes shaped by the dissolving of limestone. These areas often feature unique formations like caves and waterfalls. The region is also incredibly rich in natural resources. It is a primary source for Myanmar's famous sapphires and rubies. Additionally, the area provides important supplies of lead, silver, and zinc.

The geography of the Shan Highland is a mix of hill ranges, steep river valleys, and elevated plains. The high plains average a certain elevation, but they are sparsely populated. The terrain is cut by steep river gorges. These gorges are part of several major drainage basins. These include the Chao Phraya, the Irrawaddy, and the Sittaung. The Salween River, or Thanlwin, is also a major feature. It cuts across the plateau in a north-to-south direction.

There are several distinct subranges within this massive system. The Daen Lao Range, or Loi La Range, sits in the southern and southeastern area. This range is important because it separates the Salween watershed from the Mekong watershed. It begins at Chiang Saen in the east and reaches Doi Chiang Dao. One notable part is Doi Nang Non, a karstic formation with waterfalls. To the west, the system includes the Karen Hills, also called the Kayah-Karen Mountains. The southernmost part is the Thanon Thong Chai Range. This range includes Doi Inthanon, which is the highest point in Thailand at 2,565 metres.

History has shaped how people interact with these mountains. During the British colonial period, the hills were often called the "Shan Plateau." However, geographers note this name is actually quite incongruous. A plateau is usually a large area of relatively flat high terrain. The Shan Hills lack these wide, flat expanses. In colonial times, the town of Pyin Oo Lwin, then known as Maymyo, was a major hill station. It sits at 1,066 metres above sea level. Colonial officials used it as a retreat to escape the summer heat. Today, the area is known for tourism at places like Inle Lake.

The Shan Hills are also vital for food production in the region. Even with local instability and insurgency, the hills grow most of the potatoes in Myanmar. This makes the mountainous terrain essential for the country's food supply. The area also hosts protected nature sites. For example, the Taunggyi Bird Sanctuary was established in 1906. It originally served as the Taunggyi Wildlife Reserve before being redesignated in 1989. These sites show the connection between the land and the animals that live there.

Nature can also bring sudden and powerful changes to the region. On 24 March 2011, a strong earthquake struck the Daen Lao range. This earthquake had a magnitude of 6.8. It was a significant event that caused much damage in the eastern part of the hills. More than 70 people were killed and over 100 were injured. The tremors damaged 390 houses, 14 Buddhist monasteries, and nine government buildings.

This event reminds us of the geological forces at work in these mountains.