Temple within the naga stronghold, watched from the air by Donut's crew for anyone approaching.
With The Naga Castle captured and gassed, Donut circles above it in Party Planner watching the naga temple for approaching enemies. Carl's order over warlord chat is that if they don't see anyone coming, they might as well join Elle and Imani inside the stronghold.
It is the return point Carl worries about: if one of Vinata's family members is left behind or somehow gets sent back from Club Vanquisher, this is where they would surface.
The stronghold's temple, watched as the likeliest reappearance point for an escaping naga heir.