Silvercut

The most notable location south of the Rivermaw

Nothing else known at this time

We can make some educated assumptions though:

We can pretty easily assume that it's probably some manner of forest, likely dominated by a relatively unique type of silver tree.
We can also assume that it's somewhere in Continental Tal'Dorei, given that I don't think that the Rivermaw or The Herd of Storms were really equipped to cross an ocean when they referenced going to a location north of the Silvercut.
ALSO given that we've never heard of it and most of the on-stream events have taken place in (relatively) eastern and northern Continental Tal'Dorei, we can possibly narrow it down to western Continental Tal'Dorei, likely in the temperate belt in the middle latitudes of the continent. Alternatively, it could be south of the Stormcrest Mountains near Raishan's old hunting grounds, which we also haven't seen much of at this point in the campaign.

Type

Forest