| AMUR | River of north-east Asia forming the boundary between Manchuria and Russia (4) |
| YALU | River of eastern Asia forming most of the natural boundary between China and North Korea (4) |
| AMUDARYA | River of central Asia forming much of the northern border of Afghanistan; the ancient Oxus (3,5) |
| STYX | River forming the boundary between Earth and the underworld? (4) |
| EBRO | Which is the principal river of north-east Spain? (4) |
| LIAO | The dynasty that ruled much of Manchuria and northeastern China from 947 to 1125. |
| AVON | --- Gorge, natural cleft running west of Bristol city centre, forming the boundary with North Somerset (4) |
| TEES | Salmon river of north-east England (4) |
| WALL | Structure often forming the boundary of a kitchen garden (4) |
| OUSE | River of North Yorkshire that combines with the Trent near Goole to form the Humber estuary (4) |
| HAERHPIN | What is one of the Romanised names of the major trade and communications city of central Manchuria, the capital of Heilongjiang, and located on the south bank of the Sungari River? (2-3-3) |
| STRATOPAUSE | Level of the atmosphere forming the boundary between the stratosphere and the mesosphere, around 30 miles above sea level (11) |
| RHYMNEY | River in Wales forming the boundary between the historic counties of Glamorgan and Monmouthshire (7) |
| HUDSON | River forming the boundary between New York City and the state of New Jersey (6) |
| DRINA | River forming the boundary between Bosnia and Herzegovina and Montenegro (5) |
| AISNE | River of north-east France on which the town of Soissons stands (5) |
| SOMME | River of north-east France, scene of a battle of World War I (5) |
| YUAN | Money in Manchuria |
| HOSTA | Genus of plants of north-east Asia cultivated for its ornamental foliage (5) |
| RELICTGULL | Bird of Central and north-east Asia, similar to the Mediterranean gull (6,4) |
