Tankan (Quechua tanka a deep bifurcation, fork, -n a suffix, Hispanicized spelling Tancan) or Ruq'a Qaqa (Quechua ruq'a Opuntia floccosa), qaqa rock, Hispanicized Rucagaga) is a 5162 meters mountain in the northern part of the Wallanka mountain range in the Andes of Peru.