Shelley Island

Shelley Island is an island located off the coast of National City.

It was converted into an interplanetary port of entry by President Marsden for alien immigrants, but was shut down and abandoned after Marsden's resignation.

Overview
The island has a large monument on it of a hand holding a torch and power dampening pylons located around the island's perimeter that negate alien powers.

The island houses an immigrate processing center and video terminals that play a short video of Supergirl welcoming aliens to Earth.

History
After the Shelley Island was shut down, the Children of Liberty converted it into their base of operations.

After capturing both Supergirl and Jams Olson, the Children of Liberty intended to force James to make a propaganda video where he detonates a bomb that destroys the Shelley Island monument, while not knowing Supergirl was trapped inside. However, thanks to the intervention of Manchester Black, Supergirl threw the bomb away from the island and her and James were able to escape.

Supergirl

 * "Rather the Fallen Angel"