Mybster Crossroads lies on the edge of the flow country in Caithness, with the surrounding landscape dotted with the houses and farms that make up the scattered village of Mybster. A patchwork of fields and forestry surround Mybster, with open moorland to the south west home to wind turbines. It is a bleak and barren landscape in winter, but there is still a certain beauty to it.
The crossroads is where the B870 crosses the main A9 trunk road north to Thurso, with simple give way lines, thanks to the generally low levels of traffic this far north. There is a very slight stagger to the two arms of the B road, predominantly caused by the sharp angle of the eastern arm which heads off north east. The A9 itself runs almost due north through the junction, with the western arm of the B870 heading off to the west to Westerdale, where it also turns north and aims for Thurso.
Until relatively recently, the main road through the junction was the A895, the A9 only being rerouted to Thurso in the 1990s. Originally, however, it was the B873, until the late 1920s and the B870 route only gained its number in the mid 1930s, previously being unclassified.