The summit stands about 892 metres above the sea it overlooks, which on Vancouver Island counts as middling. Height is not what makes the ridge visible. Position is. Koksilah Ridge sits just south of the Cowichan Valley with nothing substantial in front of it, so it fills the western view from most of the valley floor and from the Saanich Peninsula north of Brentwood Bay. Look west from North Saanich or Sidney across Saanich Inlet on a clear March afternoon and the shape resolves: long gentle slopes running up to a blunt crown, more agricultural than alpine in its proportions. Snow behaves oddly on it. In a hard winter it can lie on the upper slopes for six months; in a mild one it shows for a handful of days and is gone.

Walk the ridge from north to south and you cross a great deal of time. The northern ground is Cretaceous sedimentary rock - shale, sandstone, conglomerate, the compressed leavings of ancient seafloors. Above that sits a pluton of Jurassic granodiorite, a body of coarse igneous rock that cooled deep underground long before the sediments above it existed, and it is this harder mass that holds up the summit. Around the eastern, southern and western margins of the pluton lies something older and more chaotic still: a Pennsylvanian-age jumble of argillite, greywacke, chert and diabase, assembled from fragments that arrived here by the slow violence of plate tectonics. The soils on top of all of it are thin and fast-draining - gravelly sandy loams that shed rain almost as quickly as the coast delivers it.

The forest is Coastal Western Hemlock, Douglas-fir and hemlock crowding the lower slopes, amabilis fir joining them above 700 metres where the climate turns moister. Very little of it is old. The timber industry has worked Koksilah Ridge for generations, and the native forest is broken by clear cuts of every size and vintage, most of them invisible from the valley until snow arrives and paints them white against the dark canopy. Residents watched one such cut for years. A grin-shaped patch of young second growth on the southern slope was logged off in 2008, showed brown through that summer, took its first snow in December, and by 2015 had greened over again - a full cycle of industrial forestry played out on a hillside in plain view of Duncan. Island Timberlands holds the tenure. West of the summit, at about 730 metres, sits Lois Lake, a small man-made body of water ringed by logging roads; fishless as of 1988 for want of anyone to fish it, it appeared on a 2020 list of lakes scheduled for stocking with rainbow and cutthroat trout.

Wild Deer Creek, Kelvin Creek and Glenora Creek all begin on these slopes and feed the Koksilah River - Xwulqw'selu in Hul'q'umi'num - which runs down through the valley to the sea. In recent summers that river has nearly stopped. Flows drop to critical lows exactly when farms and industry want the most water, and salmon that have used the system for millennia arrive to find it too warm and too shallow. During one severe drought the province temporarily restricted industrial and forage-crop water use in the watershed to keep fish alive. Out of that pressure came something unprecedented: Cowichan Tribes and the province agreed to build a Water Sustainability Plan for the Xwulqw'selu watershed, the first in British Columbia, weighing storage, water rights, forestry and farming together rather than one at a time. In 2021 the province also established Hwsalu-utsum Park, 143 hectares near the river, named by Cowichan Tribes and protecting pockets of old-growth Douglas-fir, rare grassland and limestone. The ridge that the first man fell onto is, at last, being managed as if the story mattered.