Sikkim's iconic Green Lake trek has reopened after a four-year hiatus, with a seven-member Russian team becoming the first group to complete the high-altitude expedition, officials said on Thursday.

Located in North Sikkim near the base of Mount Khangchendzonga, Green Lake is known for its Himalayan landscapes, glaciers and rugged mountain terrain. The trek offers adventure enthusiasts access to some of the region's remote wilderness areas, they said.