LOCATIONS REFERENCE FOR
STAR TREK: GRISSOM
THE MUTARA NEBULA
The Mutara Nebula is an interstellar dust cloud located in the Mutara Sector. The nebula contains high levels of static discharge and comprises largely of ionized gases. The combined effect of this makes a starship's sensors highly unreliable and shields inoperable when inside.
In 2285, it was the site of the horrific Battle of the Mutara Nebula. The battle ended when Khan Noonien Singh detonated the experimental Genesis Device inside the nebula, causing matter within it to re-form into the Genesis Planet. (Star Trek II: The Wrath of Khan). It is unclear if the entire nebula was consumed in the detonation (images from the USS Enterprise's escape suggest part of it survived).
THE GENESIS PLANET
The Genesis Planet was a planet located in the Mutara sector that was created from gaseous matter in the Mutara Nebula following the detonation of the Genesis Device, at the conclusion of a fierce battle between Khan Noonien Singh and Admiral Kirk. (Star Trek II: The Wrath of Khan)
Following the initial creation of the planet, Captain Spock's photon torpedo tube was launched towards it, following his funeral service. Because gravitational fields were in flux, his tube soft-landed on the planet's surface. (Star Trek II: The Wrath of Khan, Star Trek III: The Search for Spock)
The Genesis Planet immediately became a galactic controversy, and Starfleet declared it off limits until the Federation Council could decide what to do. In the meantime, the USS Grissom was dispatched with a scientific team that included the planet's co-creator, Dr. David Marcus, to carry out a thorough investigation.
Please note: Information on locations is taken from Memory Alpha
SPACELAB REGULA ONE
Regula One was a Federation research station located in orbit of the Class D planetoid, Regula, located in the Mutara Sector. In the 2280s, Regula One was under the direction of Dr. Carol Marcus, whose scientific team were working on Project Genesis.
In 2285, Regula One was raided by Khan Noonien Singh in an attempt to obtain the Genesis device for himself. While the Marcus' and the Genesis research material were transported down to Regula, the other research staff were tortured and killed by Khan as he attempted to discover where the information was from. (TOS movie: Star Trek II: The Wrath of Khan).
Afterwards, Carol Marcus and David Marcus returned to the station. (TOS comic: "The Wormhole Connection")
Pacifica is the common name for an oceanic planet in the Alpha Quadrant. A member of the Federation, Pacifica is known for its warm blue waters and fine white beaches, which make it "the jewel of the galaxy."
Pacifica is home to a variety of sentient lifeforms, including the indigenous Selkie. Humans, Betazoids, Risans and other humanoid species have lived on the planet since it was colonized by the Federation.
Located in the Taurus Reach, Pacifica was first colonized by the Federation in the 2260s. In 2266, the USS Lovell was assigned to Pacifica to help set up its civil infrastructure. (Star Trek: Vanguard novel: Reap the Whirlwind)
Starbase 67 is a Federation Starbase administered by Starfleet.
A starbase is a facility where starships are maintained and resupplied, and crews can relax. A starbase can be a research station, a military base, a place for interstellar trade or a seat of administration. Some starbases are also involved in the construction of starships. Starbases offer various services to vehicles, from medical facilities to full-fledged spacedocks capable of refitting a starship.
Starbases can be partially or completely located on a planet surface, or be limited to strictly spaceborne installations. Some are a combination of a ground-based facility with orbital components.