Among the options provided, [B] Lake Baikal is not a saltwater lake. Located in Siberia, Russia, Lake Baikal is the world’s deepest and oldest freshwater lake. It holds approximately 20% of the world’s unfrozen freshwater reserves and is renowned for its crystal-clear waters and unique biodiversity, including the Baikal seal. Unlike the other options, which either contain significant salt content or are known for their salinity, Lake Baikal remains a freshwater body, sustaining various aquatic species and serving as a vital natural resource for the surrounding region.