Tanna Tunnel
| Viewed from Kannami Station. | |
| Overview | |
|---|---|
| Line | Tōkaidō Main Line | 
| Location | Shizuoka Prefecture, Japan | 
| Coordinates | 35°06′16″N 139°01′00″E / 35.10444°N 139.01667°E | 
| Operation | |
| Opened | 1934 | 
| Operator | JR Central | 
| Character | passenger/freight | 
| Technical | |
| Line length | 7,804 meters | 
Tanna Tunnel (丹那トンネル, Tanna-tonneru) is a railroad tunnel in Shizuoka Prefecture, Japan operated by JR Central’s Tōkaidō Main Line. This 7.8 km long tunnel shortened the trunk route between Tokyo and Kobe by omitting a detour round the mountains between Atami and Numazu.