Step 1: Recall hydrogen spectral series.
- Lyman series: transitions to \(n=1\), energy gap large → ultraviolet.
- Balmer series: transitions to \(n=2\) → visible.
- Paschen, Brackett, Pfund: transitions to \(n=3,4,5\) → infrared.
Step 2: Conclusion.
Thus, the Lyman series lies in the ultraviolet region.
Final Answer:
\[
\boxed{\text{Ultraviolet}}
\]