Germany's public health agency on Thursday declared the Croatian counties of Sibenik-Knin and Split-Dalmatia, which are popular with tourists, coronavirus risk regions, as Europe battles rising coronavirus cases during the summer season, Reuters has reported.

Croatia is the country with the third-highest number of infections among people returning to Germany, according to the Robert Koch Institute (RKI), after Kosovo and Turkey, says Reuters.

Concerns are growing in Germany about rising infections. The RKI on Thursday published data showing the number of confirmed coronavirus cases in Germany climbed by 1,707 to 228,621, marking their biggest daily increase since April 26.

The RKI also added the Valcea region of Romania to its coronavirus risk list, having previously designated several other parts of Romania as high-risk.