Foundations are space stations that were created to protect the survival of the human race from the Second Wave.
AKAPUSU (アカプス) is FOUNDATION-1.
Located near Venus
STELLVIA (ステルヴィア) is FOUNDATION-2 and the setting of most of the events of Stellvia.
Located near Earth.
ODYSSEY (オデッセイ) is FOUNDATION-3.
Located near Mars.
EL SANTO (エルサント) is FOUNDATION-4.
Located near Saturn.
VISION (ビジョン) is FOUNDATION-5.
Located near Pluto.
ULTIMA (ウルティマ) is FOUNDATION-6.
Located 40 Astronomical Units "south" of Earth.