das Areal
area / site
A defined, often larger area or a specific site that is used for a purpose.
Auf dem ehemaligen Fabrikgelände entsteht ein neues Wohnareal.
A new residential area is being built on the former factory site.

area / site
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area / site
A defined, often larger area or a specific site that is used for a purpose.
Auf dem ehemaligen Fabrikgelände entsteht ein neues Wohnareal.
A new residential area is being built on the former factory site.

'Areal' (area/site) is often the second part of a compound noun that describes the purpose of the area. Common examples are 'Wohnareal' (residential area), 'Industrieareal' (industrial site), or 'Betriebsareal' (company premises).
Auf dem alten Industrieareal werden jetzt moderne Lofts gebaut.
Modern lofts are now being built on the old industrial site.
The word 'Areal' (area/site) is mainly used in formal, official, or technical contexts, for example in architecture, urban planning, or official administrative texts.
Die Stadt plant die Umgestaltung des gesamten Areals am Bahnhof.
The city is planning the redesign of the entire area by the train station.
In the meaning of 'Verbreitungsgebiet' (distribution area/range), 'Areal' (range) is a technical term from biology and geography. You can recognize this meaning from the context when animal or plant species are being discussed.
Das Areal dieser seltenen Pflanze ist auf wenige Gebirgstäler beschränkt.
The range of this rare plant is limited to a few mountain valleys.
area / field
'Bereich' and 'Areal' can both mean a defined space or area. 'Bereich' is more general and is also used for smaller parts or boundaries that are not visible. 'Areal' usually means a larger area that is seen as a whole site or used for a specific purpose, for example a 'Schulareal' (school grounds) or 'Fabrikareal' (factory site). In biology and geography, 'Areal' can also mean the range of an animal or plant species. In everyday language, 'Bereich' sounds more neutral; 'Areal' fits well when you mean a clearly recognizable site.

Das alte Fabrikareal wird zu einem neuen Wohnviertel umgebaut.
The old factory site is being converted into a new residential district.
Der Bereich am See ist ruhig und gut für Familien geeignet.
The area by the lake is quiet and well suited for families.