The Valley of the Immortals is the twenty-fifth album of the comic series Blake and Mortimer, written by Yves Sente and drawn by Peter Van Dongen and Teun Berserik, based on the characters created by Edgar P. Jacobs.

A warlord, Xi-Li, is waiting for the opportunity to take advantage of the Chinese conflict to secure his power over the entire country, thanks to a mysterious manuscript.

The cover, which shows Mortimer travelling in the streets of Hong Kong by rickshaw, is a reference to The Blue Lotus, published by Hergé in 1934–1935.

Sente also tries to explain what happened to Olrik after his defeat alongside the dictator Basam-Damdu at the end of the Secret of the Swordfish.

The theme of immortality, placed at the heart of the plot, seeks to pick up keywords typically "Jacobian" to stay close to the atmosphere of albums by EP Jacobs.