The F�rstenberg (Fuerstenberg = American spelling) that Karl Heinz gave you looks to be
the right town near the border of Mecklenburg-Strelitz and Brandenburg.
I cannot tell for sure if part is in Mecklenbug-Strelitz and part is in Brandenburg,
apparently was of the old Duchy of Mecklenburg-Strelitz, according to the parish
records at the LDS.
The other towns you listed are nearby, like Penzlin and Liepen are of the old Duchy of
Mecklenburg-Schwerin or just north of F�rstenberg in the current German State of West
Pomerania.
For general info on the old German Empire and current Germany see:
http://www.genealogienetz.de/reg/regio.htm
Old Map showing Brandenburg and F�rstenberg,
http://feefhs.org/maps/gere/ge-brand.html
(on the map showing large letters of BRANDENBURG, go to the N in BRAND and
go northeast to the border to show F�rstenberg; also see Penzlin farther north)
Old Map showing the Duchies of Mecklenburg-Schwerin and Mecklenburg-
Stelitz (F�rstenberg showing in southeast corner of map at the map edge)
http://feefhs.org/maps/gere/ge-meck.html
F�rstenberg is currently in the German Federal State of Brandenburg, and in the
county (Kreis) Oberhavel. http://www.meinestadt.de/fuerstenberg-havel/home
Also see Brandenburg info:
http://www.genealogienetz.de/reg/BRG/bb.html
For some current maps, go to Expedia.com in the "Maps" tab, and under place search
using Europe, type in F�rstenberg, Brandenburg.
I see some of the records on Peters in the IGI at the LDS website and showing
Emma Peters born on 11 March 1865 in Furstenburg, Mecklenburg-Schwerin,
Germany. This is apparently where you got your info from? It looks like they
misspelled F�rstenberg and were also unsure of its location.
Do you know if this is for sure your family?
Finally, I see the church records are available at your local Family History Center on
6 microfilms. Using this you could probably find more generations and birth,
marriage, christening, and death records. This is how I found my Kruse family
ancestors in Mecklenburg-Schwerin.
From the Family History Library Catalog
http://www.familysearch.org/eng/Library/FHLC/frameset_fhlc.asp
Kirchenbuch - Churchbook, 1646 - 1876
Parish register baptisms, marriages, deaths, and confirmations of F�rstenberg,
includes Bucholz, Mecklenburg-Strelitz, Germany on 6 microfilms.
Film Numbers: 69730, 69731, 69732, 69733, 69734, and 1348519.