Which fictional land did Tolkien describe as the home of the Ents?

Fangorn Forest is the fictional land Tolkien describes as the home of the Ents.

The forest lies at the southern end of the Misty Mountains, close to Isengard and Rohan. It is named for Fangorn, also called Treebeard, the oldest and most famous of the Ents encountered by the story’s characters. Merry and Pippin enter Fangorn after escaping from the Orcs and meet Treebeard there.

Fangorn’s Ents are tree-like shepherds who awaken to the danger posed by Saruman’s destruction of trees. Their decision to march on Isengard becomes one of the major turning points in The Two Towers. Fangorn is not the same as Mirkwood, the great forest in the north, or the Old Forest near the Shire, although all three settings contain distinctive woodland histories.