In the south coast of Dia there are four coves, from west to east Agios Georgios, Kapari, Panagia (Madonna) and Agrielia.

The island was formerly known as Standia, by juncture loss in the phrase στήν Δία (Greek for 'on Dia').

On Dia there are a number of protected wildlife species including the snail Albinaria retusa, the lizard Podarcis erchardii schiebeli, a wild subspecies of the European rabbit (Oryctolagus cuniculus cnossius), and Eleonora's falcon, known as mavropetritis in Greek.

[2] The island has been recognised as an Important Bird Area (IBA) by BirdLife International because it supports a breeding population of 300–380 pairs of the Eleonora's falcons.

[3] Dia is part of the European Network of Nature (Natura 2000) and is a protected hunting ground.