Delmak is a dark world inhabited by whatever Goa'uld happens to be in power there. The planet is fairly technologically advanced, as much of its surface is covered by fairly sophisticated structures. It is orbited by the prison moon Ne'tu.
Jolinar's Memories - SG-1 and Martouf infiltrate the prison moon of Ne'tu, in orbit of Sokar's homeworld of Delmak.
The Devil You Know - Sokar journeys from Delmak to Ne'tu, prepared to discipline the moons population. Apophis escapes to Delmak and seizes control of Sokar's army when Sokar is killed.
Enemies - Unable to decelerate Cronus' mothership, Apophis, in a flame of rage, plummets to his destruction in the atmosphere of Delmak.