The Sea of Galilee, also called Lake Tiberias, Kinneret or Kinnereth, is a freshwater lake in Israel. It is the lowest freshwater lake on Earth and the second-lowest lake in the world (after the Dead Sea, a saltwater lake), at levels between 215 metres (705 ft) and 209 metres (686 ft) below sea level. It is approximately 53 km (33 mi) in circumference, about 21 km (13 mi) long, and 13 km (8.1 mi) wide. Its area is 166.7 km2 (64.4 sq mi) at its fullest, and its maximum depth is approximately 43 metres (141 ft). The lake is fed partly by underground springs but its main source is the Jordan River, which flows through it from north to south and exits the lake at the Degania Dam.
The warm waters of the Sea of Galilee support various flora and fauna, which have supported a significant commercial fishery for more than two millennia. Local flora include various reeds along most of the shoreline as well as phytoplankton. Fauna include zooplankton, benthos and a number of fish species such as Acanthobrama terraesanctae. The Fishing and Agricultural Division of the Ministry of Water and Agriculture of Israel is listing 10 families of fish living in the lake, with a total of 27 species – 19 native and 8 introduced from elsewhere. Local fishermen talk of three types of fish: "مشط musht" (tilapia), sardine (the Kinneret bleak, Acanthobrama terraesanctae), "بني biny" (carp-like), and catfish. The tilapia species include the Galilean tilapia (Sarotherodon galilaeus), the blue tilapia (Oreochromis aureus), and the redbelly tilapia (Tilapia zillii). Fish caught commercially include Tristramella simonis and the Galilean tilapia, locally called "St. Peter's fish". In 2005, 300 short tons (270 t) of tilapia were caught by local fishermen. This dropped to 8 short tons (7.3 t) in 2009 due to overfishing.
A fish species that is unique to the lake, Tristramella sacra, used to spawn in the marsh and has not been seen since the 1990s droughts. Conservationists fear this species may have become extinct.
Low water levels in drought years have stressed the lake's ecology. This may have been aggravated by over-extraction of water for either the National Water Carrier to supply other parts of Israel or, since 1994, for the supply of water to Jordan (see "Water use" section above). Droughts of the early and mid-1990s dried out the marshy northern margin of the lake. It is hoped that drastic reductions in the amount of water pumped through the National Water Carrier will help restore the lake's ecology over the span of several years. The amount planned to be drawn in 2016 for Israeli domestic water use was expected to be less than 10% of the amount commonly drawn on an annual basis in the decades before the mid-2010s.