North eastern California is split into two regions, the northern edges of the Sierra Nevada Mountain range and north of that is a relatively flat volcanic plain extending to the Oregon border but punctuated by two massive mountains, Mt Lassen which is still active last erupting in 1911 and further north Mt Shasta which rises 14000 vertical feet above the valley floor.
Far Northern California is defined by wide open spaces and long straight roads. Bordered by Oregon to the north, Nevada to the east and Interstate 5 to the west, There are several very fun roads and sites to take in, just without the high concentration of mountains that its northwestern neighbor contains. And these destinations can be separated by long tracts of straight road, but without the rain shadow that eastern Oregon has. The region is very remote and very few people, which makes for excellent riding conditions. At the very north eastern corner of California is one of the most unknown sites, Lava Beds National Monument and Glass Mountain which most have never heard of. McArthur-Burney Falls and Mt Lassen are must-see destinations.