Tal (which means moon) Gate in Sea Chilbo is located on the eastern seashore in Mokjin-ri, Hwadae County, North Hamgyong Province.
As one of scenic attractions in Sea Chilbo of Mt Chilbo, the gate is a cave formed by abrasion and upheaval.
It is so named as it looks like the moon. Its pierced arch is 10 metres high, 8 metres long and 5 metres wide.
It is under protection as a natural monument not only for its peculiar scenery but for academic significance in studying an abrasion cave formed in the volcanic eruptive rock areas.