The first base Marlow sees in this tale is Outer Station; an accountant tells him Kurtz is at the Inner Station
He asks 
Marlow to tell Kurtz that all is satisfactory, saying he doesn't want to send a letter... [DOC] [TLE] Heart of Darkness: Summary: Part I | Novelguide [PAR] Heart of Darkness is the tale of Charlie Marlow's journey into the heart of the ... 
journey up river to Kurtz's Inner Station and his initial encounter with Kurtz.