| Aper Tief | |
| Pushpin Map: | Lower Saxony |
| Pushpin Map Caption: | Location of mouth in Lower Saxony |
| Subdivision Type1: | Country |
| Subdivision Name1: | Germany |
| Subdivision Type2: | State |
| Subdivision Name2: | Lower Saxony |
| Subdivision Type3: | Districts |
| Subdivision Name3: | Ammerland and Leer |
| Subdivision Type4: | Reference no. |
| Subdivision Name4: | DE: 3884 |
| Length: | 31.4km (19.5miles) |
| Source1 Location: | Source: Confluence of the Großer Süderbäke and Großer Norderbäke |
| Mouth Location: | south of Detern into the Jümme |
| Basin Size: | 276km2 |
| Tributaries Right: | Große Norderbäke, Hengstforder Hauptpumpgraben |
| Tributaries Left: | Nordenloher Canal |
| Custom Label: | References |
The Aper Tief is a stream in Lower Saxony, Germany.
It flows through the municipalities of Apen (district of Ammerland) and Detern in the collective municipality of Jümme (district of Leer). It begins west of Apen at the confluence of the Große Süderbäke and the Große Norderbäke, runs roughly east–west and empties south of the municipality of Detern into the Jümme. Including its source river Große Süderbäke, its total length is 31.4km (19.5miles). The Aper Tief is tidal. Its tidal range is about three quarters of a metre.[1]