one's home country; one's homeland
Refers to the country where one was born or holds citizenship, often used in contexts of living abroad or international comparison.
彼は母国を離れて十年になる。
It has been ten years since he left his home country.
母国の文化を海外で紹介する活動をしている。
I am involved in activities to introduce my home country's culture abroad.
He returned to his home country for the first time in ten years.
She left her home country and lives abroad for work.
The athletes gave their all for their home country.