This planet is the current homeworld of the Tok'ra and also functions as the current military and governmental capital.
The Tok'ra homeworld is a desert planet, that contains a large Goa'uld pyramide and an active Stargate. The planet also contains a large city, the capital of the Tok'ra, which is located close the the pyramide and the Stargate.
The Tok'ra homeworld is the location where the last of Ba'al clones, presumably the last of the Goa'uld System Lords was finally extracted from his host. During the ceremony the planet was heavily protected by parts of both the Rebel Jaffa fleet as well as the Tok'ra fleet. SG-1, along with Major General Jack O'Neill, went to the planet to watch the Extraction Ceremony.
As the ceremony was being performed, Vala Mal Doran and Teal'c vanished. After them, the Tok'ra in the city and the city itself also began to vanish. Colonel Cameron Mitchell, Colonel Samantha Carter, and Dr. Daniel Jackson quickly rushed to the world's Stargate and dialed back to Earth. However, upon arriving on Earth they found themselves in an alternate timeline, where they learned that the original Ba'al was still alive and changing history.
When Mitchell went back in time and killed Ba'al the timeline was finally fixed, and everything reverted to normal. The last of Ba'al's clones was then extracted, finally bringing the reign of the System Lords to an end. (SG1: "Continuum")