Loch Seaforth bends three times before it gives up trying to reach the sea. Look at it on the map and you can trace its temper: a northwest-southeast lower reach, a northeast-southwest middle, then a final east-west pull inland to Ceann Shiphoirt, deep in the moors. The loch does more than carve up the landscape. Its southern stretch, seaward from Bowglass, is the line on the map that separates Lewis from Harris - and until 1975 it separated the old counties of Ross and Cromarty from Inverness-shire as well. A loch as boundary, as history, as ferry-name. In the Outer Hebrides, even the water has work to do.
The loch forms the entire western coast of the Pairc peninsula, a great roadless block of bog and rock on south Lewis that almost nobody crosses on foot. Settlement on Seaforth clings to the small bays. Rhenigidale, once one of the most isolated villages in Britain, sits near the mouth and waited until 1990 for its road. Maaruig occupies the western embayment of Loch Maraig. Around the head, at Ardvourlie, the houses look out across the water to Seaforth Island, a green hump sitting in the middle of the loch where the channel turns hard to the northeast. The crofting township of Arivruaich huddles on a further inlet called Tob Cheann Tarabhaigh. None of these are large. The point of Seaforth is the water, not the people.
The name has gone to sea twice. The first Loch Seaforth was a MacBrayne mailboat, launched in 1947, that linked Stornoway with Mallaig and Kyle of Lochalsh for a quarter-century. She was a ship of the post-war decades, the kind of vessel islanders remembered by smell and engine note. On 22 March 1973 she ran aground on Cleit Rock in the Sound of Gunna, between the small Inner Hebridean islands of Tiree and Coll, and was later scrapped. The name passed to a new Calmac car ferry that entered service in 2015 on the Ullapool to Stornoway run - the lifeline route to the Outer Hebrides. A name can outlive a hull. On Lewis and Harris, the Loch Seaforth is somewhere out on the water most days.
Stand on the A859 where it climbs over Aird a' Mhulaidh and you look down into the loch's middle reach. The road is the spine of these islands, the only practical way to drive from Tarbert in Harris to Stornoway in Lewis. For most of its length it runs over peat and gneiss; here, it briefly skirts deep water. Geologists will tell you the gneiss under your feet is among the oldest rock in Europe, close to three billion years old. The loch itself is a much younger thing, gouged by glaciers and then filled by the sea when the ice retreated. What looks permanent on the map - a line between counties, a line between islands - is, in geological time, still wet paint.
57.955°N, 6.700°W. The loch runs roughly 16 km inland from the Minch. Best altitudes 3,000-5,000 ft to see the three-section dogleg shape clearly; lower in clear weather reveals Seaforth Island in the middle reach. Stornoway (EGPO) lies about 25 nm north. The Clisham, highest hill in the Outer Hebrides at 799 m, rises just west and is the obvious landmark when navigating the boundary between Lewis and Harris.