The Alay Range is a mountain range that extends from the Tien Shan mountain range in Kyrgyzstan west into Tajikistan. It is part of the Pamir-Alay mountain system. The range runs approximately east to west. Its highest summit is Pik Tandykul, reaching 5544 m. It forms the southern border of the Fergana Valley, and in the south it falls steeply to the Alay Valley. The southern slopes of the range drain into the Kyzylsuu or 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. Pik Skobeleva, 5,051 metres (16,572 ft), is also a well-known summit. European route E007: Tashkent – Kokand – Andijan – Osh – Irkeshtam crosses the range by the Taldyk Pass. The range is also traversed by Pamir highway.