“…Water pressure P w drops in the channels and in their vicinity, yielding an increase in ice-bed frictional stresses that inhibits basal sliding. Channelized water becomes the main erosional mechanism, incising channels and tunnel valleys in bedrock (Figure 1d1), in sedimentary "canals," with eskers and ice marginal deltas where sediment is deposited (e.g., Grau Galofre et al, 2018;Greenwood et al, 2007;Kehew et al, 2012;Ng, 1998;Storrar et al, 2014;Sugden et al, 1991;Walder & Fowler, 1994). Landscapes where these landforms dominate are comparatively rare, with examples in the Canadian Arctic, Antarctica, and northern Scandinavia (e.g., Grau Galofre et al, 2018;Greenwood et al, 2007;Dyke, 1999;Storrar et al, 2014;Sugden et al, 1991) (Figure 1d).…”