TAR11 sequester was Acapulco, Mexico and I think TAR 9 stayed there as well. I'll have to ask.
TAR11 had 4 legs in South America and all the teams eliminated stayed in Acapulco, Mexico then Teri and Ian were eliminated in Africa but were also sequestered in Acapulco. They were the last team sequestered that season.
puddin is essentially correct on sequesters. I did not have the opportunity to check out AR9 or AR10, but once Elimination Station started it has been easy for AR11 - AR15. What I found was:
AR11 did send the first 5 eliminated teams, 4 from South America and Ian/Teri from Zanzibar Island to Casa Legouia, Acapulco
AR12 sent the first 5 teams thorugh Shana/Jennifer to the southwest coast of Portugal
AR13 sent the first 5 eliminated teams to Casa Legouia in Acapulco, 3 from South America, Marissa/Brooke from New Zealand and Aja/Ty from Angkor Wat.
Ar14 sent the first eliminated 6 teams to Koh Samui, Thailand, through Mel/Michael in Phuket.
AR15 sent the first 6 teams to Phu Quoc, Vietnam through Canaan/Mika in Dubai.
It would be totally logical for the first 5 teams (apparently its capacity) to be sent to Casa Legouia, Acapulco.