Linked from
The 7 pages that link to China–North Korea border, each with the reason it gives.
Yalu RiverNarrower topic: The Yalu is the border’s principal river boundary.
DandongRelated: Dandong is the border’s busiest urban gateway and a key site of bilateral exchange.
Tumen RiverRelated: The Tumen forms much of this border along its middle and lower course.
North Pyongan ProvinceRelated: North Pyongan contains a major western crossing on this boundary.