Rralrark was a city on the planet Rigel IV.
It was the main city of the Rigel Trading World, and had twisting streets crowded with a multitude of alien merchants.
Captain Lorenzo Malfatti and the crew of the UNSS Marco Polo visited Rralrark in 2079 SFC (c. 2150), as part of their trading expedition to Rigel IV. They began with a sightseeing tour before beginning their trade in earnest. They saw familiar races such as Tellarites and Andorians but also many new races and cultures, which greatly expanded Earth's knowledge of the wider galaxy. The Marco Polo left with a huge profit and a bumper cargo. (ST reference: Spaceflight Chronology)