What are the countries that will be most affected by a no-deal Brexit in the short-term?

Question

I can find a lot of data about which countries currently have the most net trade with Britain, but I assume that Brexit will hit them unevenly. For instance, if a country (Germany?) mostly buys/sells heavy manufacturing to the UK, you'd expect a lag or a pre-emptive decline in trade ahead of the March deadline, whereas you'd expect a country that traded food with the UK (France?) to experience a more immediate effect.

Assuming that it will be countries that have large daily volumes of trade with Britain or trade mainly in consumable goods, or have large labor populations in/from Britain, which countries will be most immediately affected by Brexit assuming a no-deal outcome?

Answer 1

Ireland

Outside of the UK itself, it will be Ireland. Its trade will be affected the most. Not only does Ireland have just one land border, with that land border with the UK, a lot of its imports and exports physically crosses the UK. From Europe, trucks cross the channel, drive through UK and then take a ferry to Ireland.

After Brexit, the UK will lie between Ireland and the rest of the EU.