The Zurich Transport Network is divided into zones. A valid ticket can be used on all means of public transport in one zone.
S19 (ZVV) - Wikipedia
Asthenospheric low-velocity zone consistent with globally
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Zone overview of the ZVV region – ZVV
Zurich Transport Network (ZVV) – Together ahead
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Zurich Transport Network (ZVV) – Together ahead
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Zurich Transport Network (ZVV) – Together ahead