If you need to work with chunks, WorldEdit has you covered.
If you need information about the current chunk that you are standing inside, use this command.
|Tip: This function has not been updated for the world format introduced in Minecraft 1.3.|
| Example: Sample /chunkinfo output|
Chunk: 8, -17 8/1b/c.8-h.dat
You can have WorldEdit list the chunks that your selection covers. Unfortunately, this command only prints to chat and so it has limited usefulness.