Janja's Den is a volcano in the midst of the Outlands. The hyenas primarily hang out in the central chamber, though they sometimes climb on ledges ringing the chamber.
After Kion defeats the hyenas using the Roar of the Elders, Janja and his clan gather in their den, where Janja chides his minions on letting Bunga go. In the midst of the argument, Mzingo appears and reports to Janja that Kion is assembling the Lion Guard. Horrified, Janja makes plans with his clan to take down all the animals they can before the Guard is assembled. Together, the clan sings "Tonight We Strike", promising a waged battle against the Pride Lands.
When Mzingo learns that Kiara has been left in charge of the Pride Lands, he flies to Janja's Den, where he relates his discoveries to Janja. Janja decides to take advantage of Kiara's inexperience and invade the Pride Lands.
After cornering a jackal pup named Dogo, Janja accuses him of having invaded his den two days in a row.
After recruiting Nne and Tano in place of Cheezi and Chungu, Janja meets with them in his den to discuss the rules of the crew. However, Nne and Tano seize control, proposing a plan to Janja that includes sidelining the Lion Guard and scoring a meal of oryxes. Janja, who is usually not bright enough to come up with good plans, is impressed and accepts their plot.
The Lion Guard visits the den while looking for volcano ash, the cure to a scorpion sting.