Trekipedia

Delphic Expanse

A region of space nearly 2000 light years across. Sometimes likened to Earth‘s “Bermuda Triangle,” the Expanse was home to many strange anomalies and dangerous species—sometimes even the laws of physics didn’t apply. Ships had been known to return from the Expanse with their crews’ bodies anatomically inverted… if they returned at all. In 2153, Captain Archer and the crew of the Enterprise NX-01 were dispatched on a mission to the Expanse to locate a then-mysterious alien race known as the Xindi, after they were determined to be responsible for a devastating attack upon Earth.^[1]

References

• ^[1]ENT-52: The Expanse