Mt Isabel

Via Twain Col, climb south along the Main Divide over Mt Eric. The rock on
the ridge is rather rotten. See Twain Col [1].

[1] http://climbnz.org.nz/nz/si/main-divide-of-the-southern-alps/twain-col

Appears to be climbable along the Main Divide from Mt Bannie.

Appears to be climbable from the head of the McKerrow Glacier but no recorded
ascents have been uncovered.

Traverse around the north side of Awatea Peak to access Isabel-Awatea Col.
From the col, climb the ridge for about 150m on excellent rock at around
grade 10/11. A short, exposed, rising traverse at around grade 12 (one 45m
pitch) leads to an easy ledge and the base of a short steep corner. The
corner is the crux of the route and goes at about grade 14. From the top of
the corner, about 130m of steep scrambling leads to the summit. Descent was
via the NE ridge (the original ascent route) to the Isabel-Eric Col, then
down a short icefall back to the base of the route. The divide ridge was
appallingly loose rock over several steep towers and the first ascensionists
did three short abseils to get through.