The Eastern Brown Snake is widespread species in coastal and inland eastern Australia. There are numerous Museum records which show the Eastern Brown Snake scattered throughout the Sydney area and the species was probably once widespread in the region. However, it has not been recorded in the inner urban areas around the Harbour for more than 50 years, and nearly all recent records (25 years or less) have been from bushland in the in the upper reaches of the harbours northern tributaries.

The Eastern Brown Snake is a large and highly dangerous venomous snake. It grows to 2m in length and is usually light brown above and cream with pinkish spots below. Over much of the east coast young Eastern Brown Snakes are strongly banded with narrow black crossbands and have a dark head. These dark markings are progressively lost with maturity.