How have the Himalaya mountains affected trade in the south Asia region?

The Himalayas have historically posed a significant barrier for trade in South Asia due to their rugged terrain and high altitudes, making transportation difficult. As a result, trade routes had to navigate around the mountains, impacting the flow of goods between regions. However, the mountains have also created opportunities for trade by providing valuable resources such as minerals, water, and timber that have been traded within the region.