Boundary

Boundary (plural: boundaries) may refer to

Political geography

• Border

Psychology

• Personal boundaries, a life skill for protecting against having personal values compromised or violated
• Boundaries of the mind, the degree of separateness between fantasy and reality

Sociology

• Professional boundaries, relationship between any professional and his/her client
• Symbolic boundaries, a theory of how people form social groups proposed by cultural sociologists
• Boundary-work, sociology of divisions between fields of knowledge

Mathematics and physics

• Boundary (topology), the closure minus the interior of a subset of a topological space; an edge in the topology of manifolds, as in the case of a 'manifold with boundary'
• Boundary value problem, a differential equation together with a set of additional restraints called the boundary conditions
• Boundary (thermodynamic), the edge of a thermodynamic system across which heat, mass, or work can flow

Other

• Boundaries in landscape history, the divide between areas of differing land use
• Boundary (real estate), the legal boundary between units of real property
• Boundary (cricket), the edge of the playing field, or a scoring shot where the ball is hit to or beyond that point
• Boundary critique, a concept about the meaning and validity of propositions
• Boundary turbulence, a break in expectation of how private information is held within a group of knowledge owners
• Boundary Ale, a beer made by Moosehead Breweries
• The Boundary, a 2014 Chinese film
• Boundaries (film), an upcoming film

Place names

• Boundary, Derbyshire, a civil parish and hamlet in South Derbyshire, England
• Boundary, Leicestershire, a village in Leicestershire, England
• Boundary, Staffordshire, a village in Staffordshire, England
• Boundary Ranges, also known as the Boundary Range, a mountain range in British Columbia, Canada and Alaska, United States
• Boundary Country, a region of southern British Columbia, Canada
  • Kootenay Boundary Regional District, a regional district in British Columbia
  • West Kootenay-Boundary, a provincial electoral district in British Columbia
  • Okanagan-Boundary, a former provincial electoral district in British Columbia
  • Boundary-Similkameen, a former provincial electoral district in British Columbia
• Boundary Falls, British Columbia, also known as Boundary, a former railway town in the Boundary Country of British Columbia
• Boundary Waters, a region on the boundary between Ontario and Minnesota
• Stikine, British Columbia, called Boundary from 1930 to 1964, a former customs post on the Stikine River at the Alaska-British Columbia border
• Boundary City, Indiana, a community in the United States

Ships

• MV Boundary, a number of ships with this name