The Broad River is a tidal channel, in Beaufort and Jasper County, South Carolina. The channel flows mainland (West) and Port Royal and Parris Island(East). The Coosawhatchie River flows into the Broad River at the head. It joins Coosaw River channel Northeast and continues Southeast to Atlantic Ocean as Port Royal Sound. Beaufort County is a county located in the state of South Carolina. ... Jasper County is a county located in the state of South Carolina. ... Official language(s) English Capital Charleston(1670-1789) Columbia(1790-present) Largest city Columbia Largest metro area Greenville-Spartanburg-Anderson Area Ranked 40th - Total 34,726 sq mi (82,965 km²) - Width 200 miles (320 km) - Length 260 miles (420 km) - % water 6 - Latitude 32°430N to 35... Marine Corps Recruit Depot Parris Island is an 8,500 acre military installation near Beaufort, South Carolina tasked with the training of enlisted Marines. ... Port Royal is a town located in Beaufort County, South Carolina. ...