| Lomná | |
| Source1 Location: | Horní Lomná, Moravian-Silesian Beskids |
| Mouth Location: | Olza |
| Mouth Coordinates: | 49.5792°N 18.7642°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Czech Republic |
| Subdivision Type2: | Region |
| Subdivision Name2: | Moravian-Silesian |
| Length Km: | 17.6 |
| Discharge1 Avg: | 1.34m3/s near estuary |
| Basin Size Km2: | 70.6 |
The Lomná (pl|Łomna) is a river in the Czech Republic, a left tributary of the Olza. It flows through the Moravian-Silesian Region. It is 17.6km (10.9miles) long.
The name is derived from the Slavic word lom, meaning 'turn', 'bend', but and earlier also 'clatter', 'rumble'. The name was first mentioned in 1592.[1]
The Lomná originates in the territory of Horní Lomná in the Moravian-Silesian Beskids at an elevation of and flows to Jablunkov, where it merges with the Olza River at an elevation of . It is 17.6km (10.9miles) long.[2] Its drainage basin has an area of 70.6km2. The average discharge at its mouth is 1.34 m3/s.[3]
The longest tributaries of the Lomná are:[2]
| Tributary | Length (km) | Side | |
|---|---|---|---|
| Ošetnice | 9.3 | right | |
| Jestřabí | 4.6 | right |
The river flows through the municipal territories of Horní Lomná, Dolní Lomná, Mosty u Jablunkova, Bocanovice and Jablunkov.
Most of the river flows through the Beskydy Protected Landscape Area.
Among the protected species of fish living in the river are the common minnow and alpine bullhead. Part of the river is a hunting ground for Eurasian otter, also protected within the Czech Republic.[4]