The postcard RU-1836095 received yesterday shows Lake Baikal, a rift lake, in Siberia, Russia. Lake Baikal is the most voluminous freshwater lake in the world. It is also the deepest (1,642 m or 5,387 ft); the clearest; and the oldest (25 million years) of all lakes.
Lake Baikal area is home to more than 1,700 species of plants and animals, with 2/3 of those being unique to the region. It was declared as a UNESCO World Heritage Site in 1996.