육지 쪽으로 길게 들어온 좁은 바다의 입구 또는 강어귀를 이르는 말.
A long, narrow inlet of the sea, often forming the lower part of a river valley that has been submerged.
예문:
"The fishing boats returned to the safety of the firth as the storm approached."
"The Firth of Forth is famous for its iconic cantilever bridge near Edinburgh."
"Many species of migratory birds gather in the sheltered waters of the firth during winter."