noun
country of stay; host country
Refers to the country where one is currently staying, often used in contexts of travel, residence, or immigration.
滞在国での生活に慣れるまで時間がかかった。
It took time to get used to life in the country I was staying in.
滞在国の法律を守らなければならない。
You must obey the laws of the country you are staying in.