1) Sangre de Cristo Mts. (in the southern Rockies);
2) Yellowstone N.P. (in the higher Rockies);
3) Cumberland Gap (in the middle Appalachians);
4) Smokies (Appalachians, again).
5) High Peaks (Adirondacks);
6) Grampians (Scottish Highlands);
7) Cumbrian fells (Lake District, England);
8) Snowdonia (Wales);
9) Udzungwa Mts. (Tanzania).
The Ulugurus would make a nice, even set of ten, wouldn't they?