A girl holds on to a fence at a transit camp housing migrants and refugees in Slavonski Brod, Croatia.

Nearly 200,000 refugees have entered the tiny European nation of Slovenia since mid-October, despite work beginning to build a fence at the border.

Slovenian police said nearly 12,000 people entered the country from Croatia between Thursday and Friday morning, increasing the total passing through the country to 196,000, the Associated Press reported.

Slovenia — which has a population of only 2 million — has started building a razor-wire fence on its border with Croatia to stem the flow of people.

Authorities are now warning of a humanitarian catastrophe if refugees are left stranded in the small nation during what is expected to be a very harsh winter in the region.

And on the other side of the country, an Austrian Interior Ministry official said Austria is planning to build a 2.5-mile fence along its border with Slovenia in a bid to control migration, according to Sky News.