Approximately 35 kilometres (22 mi) long, it begins on the south flank of the Pemberton Icefield.
Heavily logged over the years, the valley is accessible by rough dirt road.
It is a popular cross-country skiing area in winter, partly because its middle reaches are accessible via trails from the Emerald Estates neighbourhood of Whistler.
The uppermost part of the Soo Valley features various volcanic formations.
The name "Soo Valley" was used for the skier–hippie group squat at an old lumbering camp-cum-ghost town on Green Lake, famous for a 1970s-vintage group nude photo of its inhabitants, many members of Whistler's established business community today.