Jones Creek opens to the west. It was named for the first American casualty in the vicinity. The creek is narrow and treacherous but navigable. It is a natural and convenient infiltration route for the North Vietnamese Army (NVA). Because the creek is narrow, ambush is deadly. About 200 meters north on the east bank is a US Marine outpost.
The Dong-Ha River Security Group patrols 5 areas code named One Lima through Five Lima. An LCPL River Patrol Boat is assigned nightly to each.
The PBRs of RivDiv 543 furnish 4 boats nightly, two on the lower river covering One and Two Lima, and two on the upper river covering Three through Five Lima. A Patrol Officer is assigned to the upper and lower river.
One Lima begins at the river mouth and ends at Whisky One, a large sandbar that forces the boats to make a diagonal tack from south to north when proceeding up river. It has proven to be the safest area to patrol.
Two Lima begins at Whiskey One and ends at the New Channel. Most of the successful minings of the river have occurred in this area. The mouth of Jones Creek is at the western boundary.
The New Channel is a shortcut splitting a large island into two. Both are covered with mounds, graves. The water table is so high that the dead are placed upon the ground then the earth is heaped over the bodies creating mounds. Some have monuments of stone. Some are obviously French. It is a haunted place where strange things are believed to happen.
Three Lima runs to Whisky One Three a passage around a sandbar near the south bank, across from which is the northwest tip of the northern island created by the New Channel. A tributary of the river runs behind this island connecting with Jones Creek.
Four Lima ends at Whisky Nine where the river narrows. It is a favorite fording spot for the NVA infiltrating south. The north bank is covered with large rocks a tree line and thick vegetation. Many battles were fought in this vicinity.
Five Lima runs from to the Bridge at Dong-Ha. It is the narrowest of all the patrol areas making it a natural place for sappers to mine the river. Every successful attempt at mining occurred in Two and Five Lima patrol areas.
Two other areas are patrolled infrequently. The first is Jones Creek. The other is the branch running from Whiskey Nine to Quang Tri City. During the dry summer months it is barely or not navigable at all. Both are extremely dangerous.