Boundary: something that indicates border or limit.
Frontier: an international border, the edge of the settled area of the country.
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A boundary is a physical or conceptual line that separates two areas or entities. A frontier refers to a geographical area at the edge of a settled area, often associated with exploration and expansion. In essence, a boundary marks a division, while a frontier represents a zone of potential growth or development.
A straight line is a linear shape with no curves or angles, while a frontier generally refers to a boundary or border between two regions or domains. In economics or finance, a straight line frontier may represent a simplistic model of efficient investment portfolios, whereas a frontier in geography may denote a physical boundary between countries or areas.
A natural boundary is a boundary created by natural features like rivers, mountains, or lakes. A physical boundary is a wider category that encompasses both natural boundaries and artificial boundaries created by humans, such as walls or fences.
The terrestrial land territorial boundary refers to the demarcation between different land masses or countries on the Earth's surface. On the other hand, the water territorial boundary is the line that separates the water areas belonging to different countries, often governed by international laws such as the United Nations Convention on the Law of the Sea (UNCLOS).
The earthquake tranforms boundary between the two tectonic plates.
The boundary between the two properties was marked by a stone wall.