What it is
Hanoi was once enclosed by earthen ramparts with a series of gates. Traffic passed through them between the city, the river and the countryside. Most of the walls and gates disappeared over the past two centuries. This eastern gate is the one that survived.
The gate faced the Red River, so goods and people coming off the boats entered here. Its old name was Dong Ha Mon. The present name comes from a local tradition about a military commander who is said to have died defending the gate against French troops in the 1870s. The structure has been rebuilt and restored several times, so treat it as a living landmark rather than an untouched ruin.
What to look at
Stand back across the street first. You will see a compact two-level brick structure. It has one large central arch, two smaller side arches and a watchtower on top with a tiled roof.
Then walk up close. Scooters still squeeze through the arches, which shows you how the gate has always worked as a passage, not a monument behind a fence. Look for the worn brickwork, the inscriptions above the arch and the old stone details at the base. Watch the traffic before you step into the passage.
When to go
Early morning is the calmest time. The light is soft and there are fewer motorbikes, so photos are easier. Late afternoon also works well if you plan to continue into the Old Quarter for dinner.
Midday traffic can be heavy, and the street gets noisy. Since the gate is open-air, you can pass by at any time. Just avoid rush hours if you want a clean photo.
Combining it with nearby places
Our Old Quarter walk starts here and moves west. That direction follows the historic flow of goods from the river into the market streets. From the gate, Heritage House at 87 Ma May is about 0.2 km away and Bach Ma Temple about 0.3 km. Hang Ma Street lies about 0.6 km away, and Dong Xuan Market is a short walk north. Finish at Ngoc Son Temple and The Huc Bridge on Hoan Kiem Lake, about 0.8 km from the gate.