Warp rings are a common mode of transportation in the SegaStH world between the islands/continents. Appearing like normal overgrown rings (though sizes can vary), they are most often used in combination with public transits such as trains and subways.
Largely warp rings have come to replace such modes of transport like boats and aircraft, though such are still commonly in use for jobs such as fishing, by military organizations or for nostalgia. The traditional methods are also somewhat cheaper.
The center of a warp ring is a dimensional portal. When two warp rings are "connected" to each other, it forms a gateway. However, when no connection is established, an individual may end up transported into the Special Zone.