This is the 6836th most frequent Korean word.
인천은
"인천은" translates to "Incheon is" or "Incheon as for" (topic marker in Korean).
Here, "인천은" is the subject of the sentence, marked by the topic particle "은," introducing Incheon as the topic of discussion.
인천은 한국의 항구 도시입니다.
Incheon is a port city in South Korea.
"인천은" is again the subject, marked by "은," emphasizing Incheon in relation to its proximity to Seoul.
인천은 서울에서 가깝습니다.
Incheon is close to Seoul.
In this sentence, "인천은" sets Incheon as the topic, providing information about its recognition related to the airport.