ringsum
all around
In all directions around a central point or thing; all around.
Ringsum das Haus wurde ein neuer Zaun gebaut.
A new fence was built all around the house.

all around
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all around
In all directions around a central point or thing; all around.
Ringsum das Haus wurde ein neuer Zaun gebaut.
A new fence was built all around the house.

The word 'ringsum' (all around) is made up of 'Rings' and 'um'. 'Rings' is an old genitive form of 'der Ring' (the ring), meaning 'in a circle'. Literally, then, it means 'in a circle around something'.
Ringsum das Lagerfeuer saßen die Kinder und sangen Lieder.
The children sat all around the campfire and sang songs.
As an adverb, 'ringsum' (all around) can stand at the beginning of a sentence, which leads to inversion (verb in position 2). But it can also be placed after the verb and the subject.
Ringsum herrschte Stille.
All around, there was silence.
'Ringsum' (all around) is often used to describe a landscape or the arrangement of objects. Typical verbs are 'liegen' (to lie), 'stehen' (to stand), or 'sich erstrecken' (to extend/stretch).
Das Tal war ringsum von hohen Bergen umgeben.
The valley was surrounded all around by high mountains.
everywhere
'überall' and 'ringsum' can both describe a spatial distribution. 'überall' generally means 'in all places' or 'at every location'. 'ringsum' more specifically means 'all around something', that is, in all directions around a central point. The words can be confused when something can be seen in many places. The difference is: 'überall' does not need a central point, while 'ringsum' refers to something in the middle.

Ringsum um den See stehen hohe Bäume.
There are tall trees all around the lake.
In der Bibliothek suchten wir überall nach dem fehlenden Buch.
In the library, we looked everywhere for the missing book.