Old Man Caskel's Tree (Japanese: 大樹クスキリ, Ōki Kusukiri) is a location in Xenoblade Chronicles 2. It is located on the furthest north-west point of Fonsett Island in the Leftherian Archipelago. There are no enemies or NPCs here except Foorara, who visits as his eighth stop on Foorara's Walky-Walky.
There is an excavation point here which yields a white Treasure Trove containing a common Sapphire, two Rare Core Crystals, and Gold. It requires the Field Skills Earth Mastery level 4 and Keen Eye level 6 to excavate.