Telmatobius gigas is a critically endangered species of frog in the Telmatobiidae family. It is endemic to the Huayllamarca River at an altitude of about 4,000 metres (13,000 ft) in the Carangas Province in Bolivia. Its tiny range makes it highly vulnerable to pollution, and it may also be threatened by over-harvesting for medicinal use and the disease chytridiomycosis. As suggested by its scientific name, this is a very large species of frog with a snout-vent length of up to 10.9 centimetres (4.3 in) in females (males are smaller). In the genus Telmatobius, only the equally threatened Titicaca Water Frog (T. culeus) is larger.