What is the largest reptile in the world?

This list of largest reptiles takes into consideration both body length and mass of large reptile species, including average ranges and maximum records. The crocodilians reaching a length of 4 m (13 ft) and a mass of 500 kg (1,100 lb) or more. It is worth mentioning that, unlike the upper weight of mammals, birds or fish, mass in reptiles is frequently poorly documented, thus subject to conjecture and estimation.