Historically, the region included the Baltistan (Baltiyul) valleys (now mostly in Pakistani administered part of Kashmir), the entire upper Indus Valley, the remote Zanskar, Lahaul and Spiti to the south, much of Ngari including the Rudok region and Guge in the east, Aksai Chin in the northeast, and the Nubra Valley to the north over Khardong La in the Ladakh Range. Contemporary Ladakh borders Tibet to the east, the Lahaul and Spiti regions to the south, the Vale of Kashmir, Jammu and Baltiyul regions to the west, and the southwest corner of Xinjiang across the Karakoram Pass in the far north. The historic but imprecise divide between Ladakh and the Tibetan Plateau commences in the north in the intricate maze of ridges east of Rudok including Aling Kangri and Mavang Kangri, and continues southeastward toward northwestern Nepal. Before partition, Baltistan, now under Pakistani control, was a district in Ladakh. Skardo was the winter capital of Ladakh while Leh was the summer capital.