India shares its longest land border with Bangladesh.

India shares its longest land border with Bangladesh, which stretches over 4,096 kilometers. This border is known as the India-Bangladesh border or the Indo-Bangladesh border.

Historical Background:
- The border between India and Bangladesh was established during the partition of Bengal in 1947 when India gained independence from British rule and Pakistan was created as a separate country.
- Initially, the border was not well-defined, leading to several disputes and conflicts between the two nations.
- In 1971, Bangladesh (formerly East Pakistan) gained independence from Pakistan after the Bangladesh Liberation War. This resulted in the border being redefined and demarcated more clearly.

Geographical Features:
- The India-Bangladesh border passes through various geographical features, including rivers, hills, forests, and plains.
- One of the key features along this border is the Brahmaputra River, which flows from Tibet through India and Bangladesh before merging with the Bay of Bengal.
- The border also includes the Sundarbans, the world's largest mangrove forest, which is spread across both India and Bangladesh.

Importance:
- The India-Bangladesh border is of immense importance due to the close cultural, economic, and political ties between the two nations.
- It serves as a crucial trade route, facilitating significant bilateral trade and transportation of goods between India's northeastern states and the rest of the country.
- The border also witnesses a significant movement of people, with many Bangladeshis crossing over to India for various reasons, including employment, education, and healthcare.

Border Management:
- To manage the border effectively, both India and Bangladesh have established border security forces, namely the Border Security Force (BSF) of India and the Border Guard Bangladesh (BGB).
- These forces work together to maintain the integrity of the border, prevent illegal activities such as smuggling and human trafficking, and ensure the safety and security of both nations.

Conclusion:
India shares its longest land border with Bangladesh, spanning over 4,096 kilometers. This border is of great significance in terms of trade, cultural exchange, and people-to-people movement between the two nations. Efforts are made to manage and secure this border through the cooperation of border security forces from both countries.