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There are 6 time zones in Canada.
the crops
Divided the United States into time zones
This would be a river basin.
a stream can be part of more than one watershed because streams go in different directions so they end up in different watershed +++ That doesn't really make sense. A stream can only start on one water-shed but it may pick up others as tributaries from different hills.
All time zones make their way through the 'topics': there is no 'tropical time zone'. Antarctica has no time zones. Research stations set their clock so as to coordinate with their support countries' time zones. There is no standard.
Political bounderies make up a huge part of why time zones don't run in straight lines. They also are as big as they are because there are 24 hours in a day and 24 time zones.
The railroads divided the US into four standard time zones to make their schedules more standard.
For "safe havens" infection.
Do you mean time zones? If yes, there are 5 time zones on the continent. (UTC±0 - UTC+4) Do you mean zones as in regions? As defined by the United Nations, there are five regions in Europe: Northern Europe, Southern Europe, Central Europe, Western Europe, and Eastern Europe.
The railroads divided the US into four standard time zones to make their schedules more standard.