Planet where Teal'c met with several members of the Jaffa resistance movement. When his meeting ended Teal'c attempted to dial Earth, but found he could not achieve a lock. Following protocol, Teal'c instead dialed the Alpha Site.
Teal'c later returned to 161 intending to ask for a Tel'tak so he could travel to Earth. But upon his return to the planet he found the entire rebel movement -- hundreds of warriors -- dead. Not knowing the planet was now the designated location for resistance leaders, The Trust had struck with a symbiote poison-enhanced rocket.
HOME TO - Uninhabited
FIRST APPEARED - Endgame
Endgame - Teal'c returns to P4S-161 and finds M'Zel, who informs him that when he arrived, everyone was dead.