| Smutná | |
| Source1 Location: | Jistebnice, Vlašim Uplands |
| Mouth Location: | Lužnice |
| Mouth Coordinates: | 49.2894°N 14.4689°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Czech Republic |
| Subdivision Type2: | Region |
| Subdivision Name2: | South Bohemian |
| Length Km: | 47.8 |
| Discharge1 Avg: | 1.2m3/s near estuary |
| Basin Size Km2: | 247.0 |
The Smutná is a river in the Czech Republic, a right tributary of the Lužnice River. It flows through the South Bohemian Region. It is 47.8km (29.7miles) long.
The name Smutná (literally 'sad' in Czech) refers to the calm character of the river flow.[1]
The Smutná originates in the territory of Jistebnice in the Vlašim Uplands at an elevation of and flows to Bechyně, where it enters the Lužnice River at an elevation of . It is 47.8km (29.7miles) long. Its drainage basin has an area of 247km2.[2]
The longest tributaries of the Smutná are:[3]
| Tributary | Length (km) | Side | |
|---|---|---|---|
| Milevský potok | 20.6 | right | |
| Nadějkovský potok | 8.6 | right | |
| Dobřemilický potok | 6.7 | right |
The river flows through the municipal territories of Jistebnice, Nadějkov, Vlksice, Božetice, Sepekov, Opařany, Zběšičky, Bernartice, Stádlec, Rataje, Haškovcova Lhota, Radětice and Bechyně.
There are 507 bodies of water in the basin area. A system of fishponds in built on the upper course of the river. The largest of them and the largest body of water in the entire basin area is Velká Kaplice with an area of . The fishpond Chobot with an area of is built on the middle course of the river.[2]
The Smutná is suitable for river tourism. About of the river is navigable. The river is navigable mostly in spring or after rains, but thanks to the system of fishponds, the water level in it drops only slowly after the rains.[4]