The Electris deposits is 100–200 meters thick deposit that is light-toned and appears to be weak because few boulders are seen associated with it. The deposit mostly covers ground from 30° S to 45° S and from 160° E to 200° E. So, some of it lies in the Phaethontis quadrangle

Phaethontis quadrangle

The Phaethontis quadrangle is one of a series of 30 quadrangle maps of Mars used by the United States Geological Survey Astrogeology Research Program. The Phaethontis quadrangle is also referred to as MC-24 ....

 and the rest in Eridania quadrangle

Eridania quadrangle

The Eridania quadrangle is one of a series of 30 quadrangle maps of Mars used by the United States Geological Survey Astrogeology Research Program. The Eridania quadrangle is also referred to as MC-29 ....

. Recent work with HiRISE images lead scientists to believe that the deposit is an accumulation of loess

Loess

Loess is an aeolian sediment formed by the accumulation of wind-blown silt, typically in the 20–50 micrometre size range, twenty percent or less clay and the balance equal parts sand and silt that are loosely cemented by calcium carbonate...

 that initially were produced from volcanic materials in Tharsis or other volcanic centers.
Its name is one of the Classical albedo features on Mars

Classical albedo features on Mars

The classical albedo features of Mars are the light and dark features that can be seen on the planet Mars through an Earth-based telescope. Before the age of space probes, several astronomers created maps of Mars on which they gave names to the features they could see. The most popular system of...

. In mythology it was the principal island of the "Electrides", islands said to produce amber.