The furthermost one of a number of similar things is the one that is the greatest distance away from a place. We walked to the furthermost point and then sat on the sand dunes. most distant = furthest
(comparatives of `far') most remote in space or time or order; "had traveled to the farthest frontier"; "don't go beyond the farthermost (or furthermost) tree"; "explored the furthest reaches of space"; "the utmost tip of the peninsula"