Lake Baikal
Coordinates	53°30′N 108°0′E / 53.500°N 108.000°E / 53.500; 108.000Coordinates: 53°30′N 108°0′E / 53.500°N 108.000°E / 53.500; 108.000
Primary  inflows	Selenge, Barguzin, Upper Angara
Primary  outflows	Angara
Catchment  area	560,000 km2 (216,000 sq mi)
Basin  countries	Russia and Mongolia
Max. length	636 km (395 mi)
Max. width	79 km (49 mi)
Surface area	31,722 km2 (12,248 sq mi)
Average depth	744.4 m (2,442 ft)
Max. depth	1,642 m (5,387 ft)
Water volume	23,615.39 km3 (5,700 cu mi)
Residence time	330 years
Shore  length1	2,100 km (1,300 mi)
Surface  elevation	455.5 m (1,494 ft)
Frozen	January–May
Islands	27 (Olkhon)
Settlements	Irkutsk
1 Shore length is not a well-defined measure.

Lake Baikal is a huge lake in Siberia, Russia. It is the biggest fresh water reservoir in the world. The lake is near Irkutsk.

Baikal is about 636 km (395 mi) long. It is 20 to 80 km (12 to 50 mi) wide. At its deepest point, it is 1,700 m (5,600 ft) deep. It is the deepest lake on Earth. The lake is a UNESCO World Heritage Site. It holds about 20% of the world's unfrozen surface fresh water.