The Romulan Neutral Zone, which was by the late 24th century only referred to as the Neutral Zone, was a one light year wide demilitarized zone serving as the official border between the Romulan Star Empire and the United Federation of Planets.

The First Fleet patrolled it for Starfleet in the 24th century, it headquarters was at Starbase 39-Sierra.

In 2371 the USS Lionheart was assigned the First Fleet and assigned patrol duties along the Neutral Zone.

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