frontier
The ultimate limit or unexplored area, often referring to space.
A new field of study or activity that is just beginning to be explored.
The ultimate limit or unexplored area, similar to 'final frontier'.
The next major area for development or exploration.
The border located to the west, often associated with the historical American West.
Refers to a border shared by two or more countries.
The border located to the east.
The border located to the north.
An untamed, remote, and undeveloped border region.
The limits of current technological capability.
The border between France and Spain.
The border between France and Spain.
Official checks and procedures at a national border.
A town situated on or near a country's border or in a newly settled area.
A small community established in a new, undeveloped area.
A province located on the border of a country.
The adventurous and determined character typical of people who settle in new territories.
An attitude of independence, self-reliance, and adventure associated with living in a frontier area.
Indicates movement from one side of the border to the other.
Indicates a specific location on the border line.
To go from one side of a border to the other.
To travel through and learn about an unknown area or field.
To watch over a border to prevent illegal crossing.
To have authority and power over a border area.
To force the limits of an area or field to recede.
To protect a border from attack.
To increase the scope or area of what is known or settled.
To push forward the limits of knowledge or development.
To arrive at a border.
To establish a permanent home or community in a new region.
To bring a wild and undeveloped region under control.
Used to specify the two countries or regions that the border separates.
Specifies the adjacent country or region that is bordered.