moon atlas; questions about moon

Tonight I was viewing the moon. I had a difficult time matching my view
with moon charts in books and the one from S&T.
www.lunarrepublic.com/atlas/index.shtml is a good site, though.

I am using a 4.5 Newtonian reflector, with a Plossl 10x eyepiece and a
filter. I assume that my view is upside down and right is west.

In my view, on the lower side of the moon( North in my telescope?), I
could see one large crater, and six craters near it.
The surface was flat. I also saw two craters directly right on the
edge.

Was I looking at the Northern Mare Imbrium?

Thanks.
Bruce

.

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