  We report the first results from deep ACS imaging of ten classical globular
clusters in the far outer regions (15 < R_p < 100 kpc) of M31. Eight of the
clusters, including two of the most remote M31 globular clusters presently
known, are described for the first time. Our F606W, F814W colour-magnitude
diagrams extend ~ 3 magnitudes below the horizontal branch and clearly
demonstrate that the majority of these objects are old (> 10 Gyr), metal-poor
clusters. Five have [Fe/H] ~ -2.1, while an additional four have -1.9 < [Fe/H]
< -1.5. The remaining object is more metal-rich, with [Fe/H] ~ -0.70. Several
clusters exhibit the second parameter effect. Using aperture photometry, we
estimate integrated luminosities and structural parameters for all clusters.
Many, including all four clusters with projected radii greater than 45 kpc, are
compact and very luminous, with -8.9 < M_V < -8.3. These four outermost
clusters are thus quite unlike their Milky Way counterparts, which are
typically diffuse, sub-luminous (-6.0 < M_V < -4.7) and more metal-rich (-1.8 <
[Fe/H] < -1.3).
