The Sarno, known as Sarnus to the Romans, is a stream that passes through Pompeii to the south of the Italian city of Naples.

Sarno to the Bay of Naples collecting water from the Solofrana and Cavaiola tributaries during the course of its flow.

It is part of the Sarno river basin, which covers about 715 square kilometres (276 sq mi).

Water treatment plants have been installed, however, they do not work to full capacity.

The mouth of the river continues to make bathing in the sea impossible, despite numerous protests.