This is the 10495th most frequent Korean word.
국내로
"국내로" means "domestically" or "within the country."
The word '국내로' is used here to specify the destination of the travel as being within the boundaries of the country.
저는 이번 휴가에 국내로 여행을 갈 계획입니다.
I am planning to travel domestically during this vacation.
In this sentence, '국내로' highlights the scope of the postal service, indicating that it is restricted to destinations within the country.
우체국은 소포를 국내로 발송하는 서비스를 제공합니다.
The post office offers a service to send packages domestically.
Here, '국내로' is employed to restrict the domain of participants to those within the country.