Otari II was a planet located in either the Alpha Quadrant or Beta Quadrant and was a site for a Federation cultural observation post to study the native Otarians.
Otari II is an ocean world with a handful of islands.
The oceans are inhabited by large predatory animals more than 20 meters long as well as small fish. Island groups are inhabited by land-dwelling tribal Otarians.
In 2261, the planet was discovered. At this time Dr. Ganira Lewis started six years of research on the Otarian people.
In 2267, the USS Enterprise made a small detour from its course to deliver Ensign Laura Herrada to a scientific outpost on the planet who was replacing an assistant for Dr. Lewis.
About a month later, Ensign Herrada reported the death of Dr. Lewis after she was killed by the Otarians when she entered their Mating Festival in disguise without authorization from Starfleet. Despite her death, Otarian culture remains pristine but this violation of the Prime Directive caused the outpost on Otari II to be shutdown and Ensign Herrada to be retrieved by the USS Bradbury. (TOS - Waypoint comic: "Come Away, Child")