The most popular stop along the Trans-Siberian Railway is at Lake Baikal - one of the world's largest,deepest and cleanest lakes. 600 km long and 80 km wide, It is so huge that it contains 20% of the world's fresh water supply. Sturgeon, salmon and the local speciality, omul, are producst of the lake. ..The train passes by the lake at an unspectacular angle, but most Trans-Siberian and Trans-Mongolian passengers alight at Irkutsk Station and head for the a couple days on the lake. .Hiking, fishing, boat excursions and homestays with Russian and Buryat families are popular pastimes with travelers. .