Consider the following description:
A high-altitude protected area and Important Bird Area (IBA) in East Sikkim, forming part of the Eastern Himalayas biodiversity hotspot. It extends southwards into West Bengal, connecting with Neora Valley National Park. It is known for rhododendron forests, alpine pastures, bamboo thickets, and high-altitude wetlands such as Bedang Tso Lake.
Which of the following is being described above?