Canada made the E.U.'s safe list, but it hasn't made the cut for the U.K. one; the sovereign state released a list of 59 places that are part of its new "travel corridor exemption" on Thursday, and Canada isn't among them.

The new rule — which comes into effect on July 10 — will allow travellers from countries such as France, South Korea and Vietnam to enter England without quarantining.

Canadians can still technically travel to England, but they'll have to self-quarantine for 14 days after arriving.

Portugal, the United States and Mexico were also left off the list.

Air Bridges (international travel corridors) will allow travel to England without 14-day quarantine from 10 July from the countries & territories in this OFFICIAL list I've published here 👇https://t.co/5gmIVSBK00

— Rt Hon Grant Shapps MP (@grantshapps) July 3, 2020

Notably, the new rule only applies to England; Scotland, Wales and Northern Ireland will still require all travellers to quarantine for 14 days for the time being.

England's list was determined after the Joint Biosecurity Centre ran a risk assessment on various countries, per The Telegraph.

The decision is somewhat surprising, considering that Canada is, arguably, less of a risk than other countries on the list — including England itself.

As of Friday, Canada currently has a total of 104,772 COVID-19 cases; England, in comparison, has more than double that number, with just over 244,400 cases.

Even more confusingly, Canada was on the U.K.'s original safe list, but has since been removed.

Serbia has made it onto the provisional list of countries exempt from a UK travel quarantine. pic.twitter.com/o5YZZMqjhE

— Sam Street (@samstreetwrites) July 2, 2020

Admittedly, England's population is slightly larger than Canada's population (56.28 million vs 37.97 million), so the number of cases per population could have been a factor in the decision.

Some Canadians have also suggested on social media that reciprocity could be playing a role, since Canada is virtually banning all non-residents from entering the country as of mid-March — including English citizens.

That reason does seem unlikely, however, considering that England is giving the green light to New Zealand, who is still restrcting almost all travel into the country for the time being.

Incredibly confusing. Canada was on the draft list and now not on the official one, and to make things even more confusing, the U.K. travel office have removed the travel advice restriction, but Canada’s borders are closed anyway!! What is going on??

— Adam Delbridge-Smith (@Adam_DSmith) July 3, 2020

As of July 4, people from the U.K. will no longer be advised against all non-essential to Canada, although Canada has yet to open its borders to international visitors.

For now, if you're a Canadian planning to visit the U.K. in the next few weeks, you may want to factor in an additional two weeks to quarantine during your stay.