On 10 February 1955, the last ships left. They loaded at the mouth of the Ông Đốc river, on the Gulf of Thailand coast of Cà Mau, carrying southern cadres north under the terms of the Geneva Accords — the final sailing of a regroupment that was supposed to last two years, until nationwide elections settled the question of who governed Vietnam. The elections were never held. Families who waved from this shoreline expecting a two-year separation would wait twenty, and many of the people on those decks never saw this river again. Sông Đốc is now a working fishing town of some 47,000, and it is still, first and last, a place people leave from and come back to by water.
Before it was Sông Đốc it was Khoa Giang, and the change of name is a story about a man who did not run. In 1783, with Tây Sơn forces pursuing Nguyễn Ánh through the delta, a senior naval commander — an đô đốc — is said to have stayed behind on this river to draw the pursuit onto himself while his lord escaped downstream. He was killed. The river took his rank as its name: Sông Ông Đốc, the river of the admiral, shortened in daily speech to Sông Đốc. Whether the account is history or the polish that legend applies to history, the naming stuck, and the town at the river's mouth inherited it.
Most of the Mekong Delta drains east and southeast into the South China Sea. The Ông Đốc does not. It forms inland at the confluence of the Cái Tàu and the Trẹm, near the communes of Khánh An and Hồ Thị Kỷ, and then runs roughly 58 kilometres westward across the peninsula to empty into the Gulf of Thailand — putting its harbour on Vietnam's quieter, more sheltered coast. That geography built the town. A west-facing river mouth deep enough for trawlers, opening onto fishing grounds that do not take the full brunt of East Sea weather, is a rare thing on this shore, and the fleet that works out of Sông Đốc is the reason the place exists at all.
The commune's territory does not stop at the beach. Roughly 17 nautical miles offshore lies Hòn Chuối, an island of about 70 hectares — mostly steep, mostly forested, with no roads on it whatsoever. As of 2023 some 213 people lived there in around 70 fishing households, alongside a border guard post, a naval detachment, and a lighthouse. Sông Đốc also administers the smaller Hòn Buông. Life on Hòn Chuối runs on boats and on whatever the mainland sends: everything arrives by sea, is carried up by hand, and the same is true in reverse. It is the kind of place where the arrival of a supply boat is the week's principal event.
Every year in the second lunar month the town holds Nghinh Ông, the whale festival, at a shrine dedicated to Nam Hải Đại Tướng Quân — the Great General of the Southern Sea. The title belongs to the whale. Along Vietnam's southern coast, whales are held to rescue foundering boats, and a whale that dies ashore is given a funeral, a period of mourning, and eventually a shrine for its bones. The festival is a procession out onto the water to invite the spirit in, and it is not folklore performed for visitors: in a town that has drowned as many men as this coast has, the ritual is a working piece of the community's relationship with the sea, and the crowds it draws run into the tens of thousands.
For most of its modern life Sông Đốc was a township inside Trần Văn Thời district. Then, on 16 June 2025, Resolution 1655/NQ-UBTVQH15 of the National Assembly Standing Committee reorganised commune-level units across Cà Mau, folding the old township and neighbouring territory into a single Sông Đốc commune reporting directly to the province. It covers 83.95 square kilometres across eleven hamlets — Biển Tây, Đất Biển, Mỹ Bình, Nông Trường, Rạch Dinh, Rạch Ruộng, Rẫy Mới, Tân Hòa, Thị Kẹo, Xẻo Đôi and Xẻo Quao — with a population recorded at 47,300 at the end of 2025. The district tier that once sat above it no longer exists anywhere in the province.
Sông Đốc lies at approximately 9.05°N, 104.83°E, on the Gulf of Thailand coast of the Cà Mau Peninsula, about 50 km west of Cà Mau city. From 3,000–6,000 feet the river mouth is easy to identify: the Ông Đốc arrives from the east through flat aquaculture country and opens into a crowded harbour, with the fishing fleet packed along both banks and a distinct sediment plume fanning into the Gulf. Hòn Chuối, with its lighthouse, sits roughly 17 nautical miles offshore to the west and makes a useful overwater fix. Nearest airport is Cà Mau (VVCM / CAH), 1,500-metre runway. The Gulf coast is generally the calmer of the peninsula's two shorelines, but the May-to-November southwest monsoon drives onshore winds and low ceilings here; dry-season mornings offer the best light and the fullest harbour, before the fleet sails.