Topology Bridge

In the world of Magical Girl Spec-Ops Asuka, a Topology Bridge is what connects the human world to other worlds, such as the Spirit Realm and Distonia.

There are two kinds of bridges: Permanent Bridges, of which there are 2, and Random Bridges, which appear randomly and never appear in the same place twice.

Permanent Bridges
There are two permanent bridges:
 * Copenhagen, Denmark
 * Okinawa, Japan

Random Bridges
In episode 7/chapter 12, a Random Bridge appeared on the Sarobetsu Plain in Hokkaido, Japan.