a great lake of Siberia, in the government of Irkutsk, 366 miles in length from S.W. to N.E., and from 20 to 53 miles in breadth. This vast reservoir is 1200 feet above the level of the sea. It is fed by several large rivers, namely, the Upper Angara, Selenga, Barguzin, and others; while the only visible outlet is by the Lower Angara, which is incapable of carrying off anything like the quantity of water which is received. The water is excellent, and extremely clear, so that the bottom can be seen at the depth of 8 fathoms. The depth of the lake varies from 22 to upwards of 300 fathoms. It yields abundance of fish, and there is a profitable fishery of seals on its shores during the whole summer; but the species is not ascertained. The climate is extremely severe; the waters of this great inland sea are frozen over from November, and the ice does not break up till May. This lake facilitates the Russian trade with China, and that between Irkutsk and Dauria. It is navigated by the Russians in summer, and in winter they travel across it on the ice. Steam-vessels were introduced here in 1844. Several hot springs and mineral waters are seen on the margin, and naphtha is sometimes found floating on the surface. It is between 51.20. and 55.30. N. Lat. and 103. and 110. E. Long. The island of Olkhon, near its north shore, is 32 miles long, and nearly 10 broad.