The archipelago comprises 191 uninhabited islands with a combined area of . These stretch from east to west and from north to south. One can categorize the islands into three groups, a western, central and eastern, separated by the British Channel and the Austrian Strait. The central group is further divided into a northern and southern section by the Markham Strait. Graham Bell Island is separated from the eastern group by the Severo–Vostochnyi Strait. There are two named island clusters: Zichy Land north of Markham Sound; and Belaya Zemlya to the extreme northeast. The straits are narrow, between several hundred meters to wide. They reach depths of , below the shelf of the Barents Sea.