# Boundary

Boundary or Boundaries may refer to:

## Entertainment

* Boundaries (2016 film), a 2016 Canadian film
* Boundaries (2018 film), a 2018 American-Canadian road trip film
* Boundary (cricket), the edge of the playing field, or a scoring shot where the ball is hit to or beyond that point
* Boundary (sports), the sidelines of a field

## 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 (graph theory), the vertices of edges between a subgraph and the rest of a graph
* Boundary (chain complex), its abstractization in chain complexes
* Boundary value problem, a differential equation together with a set of additional restraints called the boundary conditions
* Boundary (thermodynamics), the edge of a thermodynamic system across which heat, mass, or work can flow

## Psychology and sociology

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

## Places

* Boundary, Derbyshire, a hamlet and former civil parish in South Derbyshire and 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 County, ID, the northernmost county in Idaho
* 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

## Other uses

* MV Boundary, a number of ships with this name
* Boundaries in landscape history, the divide between areas of differing land used
* Boundary (real estate), the legal boundary between units of real property
* Boundary (company), an American application performance management company
* 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
* Geological boundary, a boundary between different geological units
* Boundary, software for secure remote access to systems based on trusted identity developed by HashiCorp