Merak II was the inhabited second planet of the Merak system in the Alpha Quadrant. The planet was a Federation member.
Plant life on this planet was the source of the oxygen in the atmosphere.
Prior to stardate 5818, Merak II was admitted to the Federation.
In that year, the planet experienced a bacterial botanical plague. The plague was treated with a toxic ore, known as zenite, which was acquired by the USS Enterprise. (TOS: "The Cloud Minders")
In 2370, Quark claimed that Elim Garak had ordered a sizing scanner from Merak II from the Ferengi. (DS9: "The Wire")
This planet was only mentioned in dialogue.
This planet's quadrant of origin is inferred based on the position of its star system as seen in the star chart appearing in the Star Trek: Picard episode "Maps and Legends".
According to the script for "The Wire", the pronunciation for Merak was "MARE-ak". However, according to StarTrek.com, the pronunciation for Merak was "MARE-ack".
According to StarTrek.com, Merak II was a M-class planet.
According to FASA's The Federation sourcebook, Merak II is the second planet in the Latis Cyrtiva system.