Administrative Information of Muong Lay ward (Post-2025 Merger)
- Merged from: Song Da ward, Na Lay ward, Lay Nua commune, Sa Tong commune
- Total area: 222.65 km²
- Population: 18,208 people
- Population density: 81.78 people per km²
- Administrative headquarters (new): Trụ sở Thị ủy, HĐND và UBND thị xã Mường Lay
Map of Dien Bien province After the 2025 Administrative Merger
The map below provides an updated view of Dien Bien province and its new administrative boundaries after the 2025 national merger, helping users easily identify the location of Muong Lay ward and nearby wards/communes.

Official map of Dien Bien province after the 2025 administrative restructuring (Source: Ministry of Agriculture and Environment – Vietnam Resources and Mapping Publishing House).