Out on the Cumbrian shore of the Solway Firth, at the far western end of Hadrian's frontier, Biglands is a farmhouse name attached to the site of a small Roman milefortlet, one of the posts that carried the Wall's chain of defences down the coast once the stone curtain itself had stopped at Bowness. There is very little to see above ground; the fortlet was excavated and then returned to the grass. What you come for is the setting and the sense of standing at the edge of an empire, looking across a few kilometres of mud and water at Scotland.
The Solway is a strange, compelling landscape. Salt marsh stretches out for miles, cut by creeks that fill and drain with the tide, and the bore can come in surprisingly fast. Across the water Annan and the hills of Dumfriesshire look close enough to touch, which is exactly why the Romans watched this coast so closely: at low tide the firth could be waded by raiders who knew the fords. In winter tens of thousands of barnacle geese from Svalbard settle on the marshes, and the sky fills with noise at dusk.
Roads out here are narrow, flat and quiet, running behind the sea dyke between Bowness-on-Solway, Port Carlisle and Glasson. One stretch near Port Carlisle floods on the highest tides, so look at the water rather than trusting the tarmac; signs warn you, and they mean it. Expect gravel washed onto corners, the odd sheep and wind straight off the Irish Sea that leaves you leaning into the gusts. Visibility is long and the light changes by the minute, which makes it a lovely evening ride if the weather is kind.
Annan is the nearest real town as the crow flies, but there is no bridge across the firth, so by road your services are back towards Carlisle or Wigton, half an hour or so away. The villages have the occasional pub, and Bowness marks the start, or finish, of the Hadrian's Wall Path, so walkers will be the people you meet. Bring a layer: even in July it can feel like October on the marsh.