Sumidero del arroyo Ursulo-errekatxo en Aretxabaleta-Degurixa. A 985 metros s.n.m. y a unos 15 minutos de la campa de Degurixa camino de Aumategi. Algunas orientaciones: Olaburueta 325º, Aumategui 155º, Aranguren-gaña 345º; (Juan San Martín 25-II-1952).
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