Can I marry with my own maternal uncle's own sister-in-law?

I don't see why not. She isn't blood related. Or is this a question of a specific religion?

Yes, this a question of a specific religion.
I am from muslim community..

I will move this post to the proper forum.

While some sects have more stricter view points on it, my Muslim friend is here with me, and said, that this is not a problem and is OK.

Please open the links below you may find an answer, Thanks.

Whom one is allowed to marry - Islam web - English

http://en.wikipedia.org/wiki/Cousin_marriage