The Isturitz and Oxocelhaya caves (French: Grottes d'Isturitz et d'Oxocelhaya) are an important Paleolithic site where a Neanderthal mandible was found, as well as later modern human finds associated with the Aurignacian, Solutrean and Magdalenian. They also include cave paintings and bone flutes. The caves are located in the Gazetelu hill in the Arberoue Valley in the foothills of Pyrenees, in Lower Navarre, a traditional region of the department of Pyrénées-Atlantiques, southwestern France, part of the French Basque Country.