dingle

metsäinen laakso A small, narrow or enclosed, usually wooded valley.
1954, w:J._R._R._Tolkien J. R. R. Tolkien, w:The_Two_Towers The Two Towers, w:The_Two_TowersBook_III:_The_Treason_of_Isengard Book III, Chapter 4

Turning to the left and skirting this huge hedge Treebeard came in a few strides to a narrow entrance. Through it a worn path passed and dived suddenly down a long steep slope. The hobbits saw that they were descending into a great dingle, almost as round as a bowl, very wide and deep, crowned at the rim with the high dark evergreen hedge.