The only country without a rectangular flag is which mountainous country in Asia?

This landlocked Himalayan nation boasts the world's only national flag that is not a quadrilateral. Instead of a rectangle, its flag is composed of two stacked triangular pennants, a shape known as a double-pennon. This unique design is rich with meaning, as the two points are said to represent the majestic peaks of the Himalayas. The triangles also symbolize the country's two main religions, Hinduism and Buddhism, living together in harmony. This design has historical roots in the triangular flags that were once common across South Asia.

The flag's details are just as symbolic as its shape. The crimson red background is the color of the rhododendron, the national flower, and also represents the bravery of the nation's people. A deep blue border outlines the flag, signifying peace. Emblazoned on the pennants are two celestial bodies: a crescent moon on the top and a sun on the bottom. These emblems represent permanence and the hope that the nation will last as long as the sun and the moon. The modern version of this iconic flag was officially adopted in 1962.