die Begrenzung
boundary
A physical line or object that marks the edge or end of an area.
Die weiße Linie dient als Begrenzung des Spielfelds.
The white line serves as the boundary of the playing field.

boundary / limit
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boundary
A physical line or object that marks the edge or end of an area.
Die weiße Linie dient als Begrenzung des Spielfelds.
The white line serves as the boundary of the playing field.

'Begrenzung' (boundary/limit) belongs to the word family of 'die Grenze' (the border/boundary). It is the nominalization of the verb 'begrenzen' (to limit). The ending '-ung' turns the action of limiting into a noun.
Die Regierung plant eine Begrenzung der Einwanderung.
The government is planning a limit on immigration.
In the meaning of 'limit' or 'restriction', 'Begrenzung' (limit) is very often combined with a genitive that indicates what is being limited. Examples are 'die Begrenzung der Geschwindigkeit' (the speed limit) or 'die Begrenzung der Kosten' (the limitation of costs).
Die Begrenzung der Teilnehmerzahl ist notwendig, um die Qualität zu sichern.
The limit on the number of participants is necessary to ensure quality.
'Begrenzung' (limit) often forms the second part of compound nouns that describe a specific type of limit. Well-known examples are 'Geschwindigkeitsbegrenzung' (speed limit), 'Altersbegrenzung' (age limit), or 'zeitliche Begrenzung' (time limit).
Auf dieser Autobahn gibt es keine Geschwindigkeitsbegrenzung.
There is no speed limit on this highway.
border / limit
'die Grenze' and 'die Begrenzung' can both show where something ends or is restricted. 'Grenze' is the normal word for the line between countries or areas, and also for a general limit. 'Begrenzung' often refers to something that was deliberately set or built, for example a barrier, a line, or a rule. The words can be confusing because both mark an end. If you mean the dividing line itself, 'Grenze' is usually more natural. If you mean the measure or object that restricts something, 'Begrenzung' fits better.

Bei schlechtem Wetter bleibt die Begrenzung um den Sportplatz geschlossen.
In bad weather, the boundary around the sports field remains closed.
Die Grenze zwischen den beiden Ländern verläuft durch den Fluss.
The border between the two countries runs through the river.