Interesting topic. Let's take this continent by continent
Asia
Asia is almost entirely wiped out, barring small pockets of resistance. Huge population density dooms China and India and everything surrounding them, even the harsh climate of Afghanistan would be simply swamped by an enormous walker herd who can only head in their direction. Everything is wiped out until the herd hits a bottlenose at Suez, at which point they're heading north (I'll come back to that)
Africa
Simply doesn't stand a chance and would be like shooting fish in a barrel. The lack of transport, communication, food, education & weaponry condemn all the poorest nations and the more developed nations are simply overrun. Even Madagascar, in theory a haven, would be overrun with the rich people flocking there by boat from South Africa.
South America
All the big cities fall immediately due to poor infrastructure and essentially condemn the whole continent. Native cultures, while shielded from the general population, don't fare much better due to a harsh environment, shorter life-span and information vacuum but theirs is a slow death as the quick population turnover they're reliant on is damaged.
North America
Utter chaos and paranoia take over the US as the big cities fall immediately and the population heads in-land, only to be greeted by gun-wielding middle-America who aren't too pleased by their uninvited guests and the walker outbreaks they bring with them. Clashes would be inevitable and with civil unrest comes more death. In the South, civil unrest is also order of the day as Mexicans cross the border in droves, which also also doesn't go down too well with the locals. To the south, Costa Rica and Panama easily close their borders & are shielded by their environment, making them one of the safer places in the world, while Cuba and the West Indian islands are swamped by boats from Florida. Canada is invaded by Americans and only it's northern territories survive in the extreme cold. Greenland survives due to it's small population and isolation but is condemned to a slow death without the support from it's neighbours.
Europe
Eastern Europe is wiped out by the herd heading north from Suez and the rest of Europe doesn't fare much better as Iberia is swamped from North Africa and central Europe is quickly overrun. France tries to surrender & Switzerland declare themselves neutral but the walkers don't take much notice. Sections of Scandinavia are protected by their winter but struggle to defend themselves when summer comes, this gives them time though to get organised and they manage better than most. The UK falls quickly and Ireland follows as the remaining Brits head west, only the Scottish islands survive, along with Iceland which becomes one of the the safest places in the world as it shuts all it's borders.
Oceania
Many of the more famous islands around Polynesia are taken over as the Chinese and Japanese arrive, this of course condemns them to collapse and a domino affect kills off many other islands in the process. Only faraway places like Fiji and New Zealand survive this influx, New Zealand in particular thrives as a self-sustaining environment with a small population that splits into 2 manageable sections. The cities of Australia are largely wiped out but the small isolated communities survive, surrounded by a harsh protective environment.
Summary
Nature prevails as usual and it's only small isolated communities that are self-sustaining and able to survive. North America is too isolated from another surviving colony to be viable, as is Eastern Russia, Iceland is forever on it's own because Europe can never be rebuilt properly and Scandinavia is only ever safe part-time. Of all these small communities, it's only Oceania that offers any real hope of rebuilding. Australia, along with New Zealand & the many surrounding islands presents a manageable chance to recolonise and quarantine a section of the world.
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