The GiANT TORTOiSE..
The Aldabra giant tortoise (Aldabrachelys gigantea), from the islands of the Aldabra Atoll in the Seychelles, is one of the largest tortoises in the world.(Information taken from Wikipedia)
The biggest turtle in the world is the 1. Galapagos Tortoise 2. Aldabra Tortoise 3. Sulcatta Tortoise The biggest freshwater turtle in the world is the 1. Alligator Snapping Turtle 2. Pignose Turtle The biggest sea turtle in the world is the 1. Leatherback Turtle
Three species of tortoise come to mind when you say "giant tortoise." The Sulcata or African Spur-thigh tortoise (Geochelone sulcata) is a relatively large tortoise native to Africa, obviously. They're common in the pet trade and have a dusty brown colored shell. The Aldabra tortoise (Aldabrachelys gigantea) is often seen in zoos, as its immense size is quite an attention-getter, however, care requirements for such an animal have kept it from attaining popularity as a pet. It's native to the Aldabra atoll off the east coast of Africa and has a dark gray to black shell. The third is the Galapagos Giant tortoise (Chelonoidis sp.). These are the largest tortoises in the world, and are seen in captivity (off their native islands, that is) very rarely. Species from different islands often have unique physical features that ensure survival on that island. They live in the Galapagos archipelago, which belongs to Ecuador. I hope one of these is the chelonian you're looking for.
A Leatherback turtle (Dermochelys coriacea), was found washed up on Harlech beach, Gwynedd Wales in 1988. It was autopsied and found to weigh 914 kilos (2,016 pounds) with a length of 9 feet.Sadly this beautiful creature was trapped in fishing nets which caused it to drown before being found.Next in line is the Galapagos turtle (Geochelone nigra) being the largest land dwelling turtle (more likely or properly being called a tortoise) with full grown adults weighing up to 900 pounds and growing as long as 6 feet.
The desert tortoise.
sulcata
330 pounds
I think the largest Tortise is the giant tortise of the Galapagos Islands which belongs in the Kinyxis group.
The largest species of tortoise, the Galapagos tortoise, can weigh up to 900 pounds and reach lengths of over 4 feet. Other tortoise species can range in size from a few inches to several feet in length, depending on the species.
Galapagos Giant Tortoise is the official animal of Galapagos. The Giant tortoise found at Galapagos is the largest species of tortoise in the world, They can grow up to 2 meters and weights in the range of 300 to 400 pounds.for more information on Giant Galapagos Tortoises
Aldabra giant tortoise and averages 120 centimetres (47 in) in length. The average weight of a male is around 250 kilograms (550 lb), but one male at the Fort Worth Zoological Park weighs over 360.25 kilograms (794.2 lb). Females are generally smaller than males, with average turtle measuring 90 centimetres (35 in) in length and weighing 150 kilograms (330 lb).
the narwhal is another largest porpoise on the planet