Related Clues:
- Natural trench
- Water trench
- Region between hills
- Geological depression, and what the first word of 20-, 37- and 56-Across is
- ___ girl (classic ditzy type)
- Area between mountains
- San Fernando, e.g.
- San Fernando, for one
- Drainage channel
- Depression between ranges of hills
- Long depression in the surface of the land
- Flat area of land flanked by hills
- After five there's nothing of the highway about this
- One gets in the way of a bird down there
- A little way down here after five