The Dead Makou Tree (Settlement)

You may be looking for the Maku Tree of the same name.

The Dead Makou Tree is the lifeless husk of an ancient Maku Tree that sacrificed his life to stop the spirits leaking from Termina into Hyrule.

History
Located in an isolated valley in the mountains of the Land of Famine, this giant dead tree is home to the Poes that tried to escape from Termina. From here they travel throughout all of Hyrule, some even reaching the distant Labrynna, like the Shadow Hag.

Their rumored leader, a large Poe called Jalhalla, is said to seldom leave the Makou Tree's dry insides. Sightings of this being are rarer than those of other Poes, some even claiming he is just a combination of many Poes in one place. No one dares venture to the Dead Makou Tree to find out if the rumors of Jalhalla are true, and they are wise to do so.

Only a fool's army would try and seize the tree in an attempt to defeat Jalhalla and take control of the ghastly Poes. Though perhaps a bit of foolishness is what is needed to conquer the Haunts for good.