Long Xuyên sits on the Hậu River, the western of the two great Mekong branches that split Vietnam's delta, roughly 190 kilometers from Ho Chi Minh City and 45 from the Cambodian border. Its 115 square kilometers hold something near 286,000 people across thirteen commune-level subdivisions, and the thing that organizes all of it is not the street grid but the canal grid. A working port sits in the middle of town. Barges tie up three deep. Rice comes downstream from the Long Xuyên Quadrangle — the vast reclaimed floodplain the city anchors — and basa, the delta's export catfish, goes out from pens along the river. The canals made this economy possible and continue to complicate it. Cutting more of them has been a reliable way to raise output, and a reliable way to move whatever is happening upstream — floodwater, effluent, salt — straight into town.

Order bún cá in Long Xuyên and you get the city's argument for itself in a bowl: snakehead fish poached and flaked, a broth soured with tamarind and stained yellow with turmeric, rice noodles, and a fistful of herbs and shredded banana blossom you tear in yourself. Vendors sell it from the curb starting before dawn. The other local staples are mắm thái, a shredded fermented-fish preparation the delta treats as a condiment and outsiders treat as a dare, and the smoky brown sugar boiled down from thốt nốt palm sap in the fields toward Cambodia. The Gulf of Thailand is two hours west, the Cambodian border less than an hour north, and Long Xuyên's kitchens have spent generations taking what passes through.

An Giang University enrolls more than 10,000 students, making it the second-largest university in the Mekong Delta, and for years its rector was Võ Tòng Xuân — an agronomist whose reputation rested on getting new rice varieties out of research plots and into the hands of farmers who could not wait for a bureaucracy to approve them. That instinct fits the place. Long Xuyên is also home to the Thoại Ngọc Hầu high school, a selective institution of more than 2,000 students named for the Nguyễn-dynasty general who dug the canals that made this land farmable, and to a teacher-training college. In a province where rice is not a crop but the entire proposition, the schools are infrastructure.

Tôn Đức Thắng was born on 20 August 1888 on Mỹ Hòa Hưng, the river island opposite the city that everyone calls Cù Lao Ông Hổ, Tiger Island. He trained as a mechanic, went to sea, and later described taking part in a 1919 mutiny in the Black Sea aboard a French cruiser — an episode the historian Christoph Giebel has argued was constructed after the fact to bind Vietnamese communism to the Russian Revolution. What is not disputed is the sentence: arrested in 1929, he spent sixteen years in the prison colony on Côn Đảo, until 1945. He became President of North Vietnam on Hồ Chí Minh's death in September 1969, first president of the reunified country in July 1976, and died in Hanoi in 1980 at ninety-one. His birthday is still marked on the island. Nguyễn Ngọc Thơ, vice-president of the Republic of Vietnam in Saigon, came from the same small city — two careers begun in the same riverside town and finished on opposite sides of the same war.

Long Xuyên's skyline is a survey of southern Vietnamese religion. There is a Cao Đài temple, one of relatively few this far into the delta, with the all-seeing Divine Eye above its doors. The Catholic diocese of Long Xuyên counted some 230,000 members when it marked its sixtieth anniversary in 2020, and its churches are ordinary features of the neighborhoods. Hòa Hảo Buddhism, founded in 1939 by the young prophet Huỳnh Phú Sổ at Hòa Hảo village upriver in what is now Phú Tân, has its densest concentration of followers in these districts — this is its heartland, if not quite its birthplace. And with Cambodia so close, a substantial Khmer population lives here, bringing Theravada practice into a city otherwise shaped by Mahayana. Four traditions, one riverbank, no particular friction.