border
legal boundary between two territorial regions
Taiwan Strait
strait between mainland China and Taiwan
Durand Line
border between Afghanistan and Pakistan
Military Demarcation Line
de facto land border between North and South Korea
baseline
the line from which the seaward limits of a state's territorial sea and certain other maritime zones of jurisdiction are measured; normally, a sea baseline follows the low-water line of a coastal state
front-line
in military terminology the position(s) closest to the area of conflict
Black-Allan Line
176.5km eastern most part of the NSW and Victoria border
northwesternmost point of the Lake of the Woods
landmark for the boundary between United States and Canada
Natural frontiers
international borders based on physical features
border barrier
wall or barrier at national boundaries
Colombia-Venezuela border
international border
Boundaries of Hong Kong
internal boundary of China
tree line
edge of the habitat at which trees are capable of growing
demarcation line
geopolitical border, often agreed upon as part of an armistice or ceasefire
language border
geolinguistic boundary between mutually intelligible speech communities
Pale of Settlement
forced distribution of Jewish population in the Russian Empire
field margin
small area of agricultural land
Radcliffe Line
boundary of the Partition of India
natural border
political borders corresponding to geographical barriers
invisible wall
boundary feature in some video games
Frontera entre Trinidad y Tobago y Venezuela
Frontera limítrofe entre Trinidad y Tobago y Venezuela
war front
contested armed frontier between opposing forces
political border
boundary line between two territories, for example countries, states, provinces, cities
Willow Palisade
former 1000 km long barrier separating Manchuria from both Mongolia and Liaoning
Russia-Kazakhstan border
separates the territories of Russia and Kazakhstan
Partition of Ireland
the division of the island of Ireland into two distinct jurisdictions, Northern Ireland and Southern Ireland, on 3 May 1921; the latter became independent in 1922 and is now the Republic of Ireland, while the former still remains in the UK
International Date Line
imaginary line that demarcates the change of one calendar day to the next
terminator
moving line that separates the illuminated day side and the dark night side of a planetary body
Inter-Entity Boundary Line
intra-country border between entities in Bosnia and Herzegovina
Western Australia border
borders of Western Australia
timberline
line below which trees form a forest with a closed canopy
biogeographic boundary
borders which separate fauna or flora
isogloss
geographic boundaries between where linguistic features are used
Frontier Closed Area
restricted border area of Hong Kong