Passage: The Alay or Alai Mountains (Kyrgyz: Алай тоо кыркасы; Russian: Алайский хребет) constitute a mountain range that extends from the Tien Shan mountain range in Kyrgyzstan west into Tajikistan. It is part of the Pamir-Alai mountain system. The range runs approximately east to west. Its highest summit is Pik Tandykul (Russian: пик Тандыкуль), 5544 m. The southern slopes of the range drain into the Vakhsh River, a tributary of the Amu Darya. The streams that drain the northern slopes of the range are tributaries of the Syr Darya, and empty into the Fergana Valley to the north of the range.

Question: What is the highest summit in the Pamir-Alai mountain system?
Pik Tandykul