 Tayvallich is split into two areas; Carsaig and Tayvallich.Loch Sween cuts northeast into the Knapdale Peninsula and the western shore of the loch forms a smaller peninsula.Towards the north end of this peninsula an isthmus is formed about a kilometre wide and the east side has an almost landlocked bay which is where Tayvallich is located and the west side of the isthmus is Carsaig Bay.