Port Logan, formerly Port Nessock, is a small village in the parish of Kirkmaiden in the Rhins of Galloway in Wigtownshire. The Gaelic name is Port Neasaig.
Port Nessock Bay is now all that remains of the western end of a strait that in post-glacial times separated the main part of what is now the Rinns of Galloway from three smaller islands to its south. There was a ruined pier in the bay in 1790, at which time kelp and samphire were gathered on the coast to the south.The village was planned; it was created by Colonel Andrew MacDowall, the laird of Logan, in 1818. MacDowall erected a quay and bell tower designed by Thomas Telford, and a causewayed road leading to them.
Wikipedia https://en.wikipedia.org/wiki/Port_Logan
Coordinates 54°43'24.254" N -4°57'16.66" E