To determine which country shares India's longest land border, we need to compare the lengths of the borders India shares with its neighbors. The question asks specifically among the given options: Myanmar, Bhutan, Bangladesh, and Pakistan.
India's land borders have varying lengths with its neighboring countries. Here's a breakdown focusing on the options provided:
| Country | Approximate Land Border Length with India (km) |
| Bangladesh | 4,096.7 km |
| Pakistan | 3,323 km |
| Myanmar | 1,643 km |
| Bhutan | 699 km |
Comparing the approximate lengths:
Therefore, India shares its longest land border with Bangladesh.
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