
der Großraum
metropolitan area
An extended geographic region that includes a metropolis and its surrounding area; an urban agglomeration.
Im Großraum Frankfurt gibt es viele Arbeitsplätze.
There are many jobs in the greater Frankfurt area.
metropolitan area / open-plan space
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metropolitan area
An extended geographic region that includes a metropolis and its surrounding area; an urban agglomeration.
Im Großraum Frankfurt gibt es viele Arbeitsplätze.
There are many jobs in the greater Frankfurt area.

open-plan space
A large, open interior space without partition walls, especially in offices (open-plan office) or trains (open coach).
Ich reserviere lieber einen Platz im Abteil als im Großraum.
I prefer to reserve a seat in a compartment rather than in an open coach.
The word is a simple compound of 'groß' (large) and 'Raum' (space/area). So it describes either a large geographic region or a large, open interior space.
Das Unternehmen hat seinen Sitz im Großraum Stuttgart.
The company is based in the greater Stuttgart area.
You can recognize the meaning from the context. If 'Großraum' (metropolitan area) appears with the name of a city, it refers to the geographic region. In connection with 'Büro' (office) or 'Wagen' (coach/car), it refers to an open interior space.
Der öffentliche Nahverkehr im Großraum Hamburg wird ausgebaut.
Public transport in the greater Hamburg area is being expanded.
In the meaning of 'open interior space', 'Großraum-' is very often used as the first part of a new word. The most common examples are 'das Großraumbüro' (open-plan office) and 'der Großraumwagen' (open coach, on a train).
Die Arbeit im Großraumbüro kann sehr laut sein.
Working in an open-plan office can be very noisy.
metropolitan region
Der Großraum and die Metropolregion both refer to a large city region and its surrounding area. Der Großraum can be broader in scope, while die Metropolregion usually refers to a densely populated area that is closely connected to the core city. Use Metropolregion when this close connection is the main focus.

Im Großraum Berlin leben viele Menschen auch außerhalb der eigentlichen Stadt.
Many people in the greater Berlin area live outside the city proper.
Die Metropolregion Berlin ist wirtschaftlich eng mit der Hauptstadt verbunden.
The Berlin metropolitan region is closely connected to the capital economically.