The first base Marlow sees in this tale is Outer Station; an accountant tells him Kurtz is at the Inner Station
Before 
Marlow begins his tale, however, ... Marlow meets the Company's chief 
accountant, ... tral Station, where Marlow first sees the ship which ... come across 
an abandoned hut with a sign telling ... him about Kurtz's greatness, his genius, 
his ability.