Karakoram mountain range
The Urdok ridge is a 7426 m high mountain ridge follows the continuation of the southwest ridge of Gasherbrum I. 
Two main chains of the Karakoram range meet on this ridge. Along the Urdok ridge, there are several peaks. From north to south these include:
Urdok I (7,250 also known as Urdok Kangri I), and an unnamed peak (7,136 m), before the ridge reaches the Abruzzi Saddle mountain pass (6,782 m). The Abruzzi Saddle marks the boundary between the Gasherbrum group and the Sia Kangri massif. 
Continuing south, the ridge rises to Urdok II (7,082 m) and Urdok III (6,950 m) before reaching Sia Kangri. Some recognize Urdok II as Sia Kangri North.
Nomenclature.
In 1934, Günter Oskar Dyhrenfurth explored the region while looking for access points to climb Gasherbrum I. He named the Urdok ridge as it drops off to the northeast towards the Urdok Glacier. The glacier was already known by this name on the Chinese side of the Karakoram at this time.
Climbing history.
There is little recorded history of climbs of mountains of this group. 
Urdok I.
Urdok I was climbed for the first time in 1975 by an Austrian expedition led by Hanns Schell. While "enroute" to Gasherbrum I, the expedition detoured to summit Urdok I, summitting Gasherbrum I several days later. 
Urdok II.
In 2018, Luis Stitzinger led a team from Amical alpin to be the first to summit Urdok II. After considerable snow fell at base camp, the team abandoned the expedition, and moved to summit Gasherbrum I.