Statement I is correct: Yaya Tso Lake is located in the Changthang region of Ladakh. Statement II is correct: Yaya Tso was declared as Ladakh's first Biodiversity Heritage Site under the Biological Diversity Act in 2023. Statement III is correct: Yaya Tso is a significant nesting ground for various migratory birds, including the Black-necked Crane, earning it the moniker "bird's paradise". Statement IV is incorrect: Yaya Tso Lake is part of the high- altitude plateau lake system and is fed by snowmelt and local streams, not the Sutlej river. The Sutlej river flows through different parts of the Himalayas and Punjab.