Explanations:The question pertains to the geographical features of Himachal Pradesh, specifically focusing on a lake that is known for having a floating island. The floating island is a unique natural phenomenon that occurs in certain lakes due to the accumulation of organic matter and soil on the surface of the water. This accumulation forms a floating mass that can move with the wind and water currents, creating a distinctive feature that is not found in many other lakes.
Khajjiar Lake, located in the Chamba district of Himachal Pradesh, is renowned for this feature. The lake is situated at an elevation of approximately 2,100 meters and is often referred to as the "Mini Switzerland of India" due to its picturesque beauty. The floating island in Khajjiar Lake is a result of the accumulation of organic matter and soil, which has formed a floating mass that can be observed moving across the lake's surface.
Other lakes in Himachal Pradesh, such as Chandra Taal, Bhrigu Lake, and Kareri Lake, are also notable for their scenic beauty and are popular destinations for tourists and trekkers. However, they do not possess the unique feature of a floating island. Chandra Taal, located in the Lahaul and Spiti district, is a high-altitude lake known for its stunning views and is a popular trekking destination. Bhrigu Lake, situated in the Kullu district, is another high-altitude lake that is known for its serene beauty and is a popular spot for trekkers. Kareri Lake, also located in the Kullu district, is a high-altitude lake that is known for its stunning views and is a popular trekking destination.
Therefore, the correct answer to the question is Khajjiar Lake, as it is the only lake among the options that is known for having a floating island. This unique feature makes Khajjiar Lake a distinctive geographical landmark in Himachal Pradesh.