These are HUGE reptiles compared to the domestic tortoise that we all know & love. Giant tortoises are reptiles of certain tropical islands. They can often reach enormous size & can weigh as much as 300 kg (660 lbs) and can grow to be 1.3 m (4 ft) long. They live in the Seychelles, the Mascarenes and the Galapagos Islands. Some species are recently extinct.