Pastavagge (in Lule Sami Orthography called "Basstavágge") is a narrow valley, forming a pass, running from Pielavalta ("Bielavallda") towards the east, ending north of Rinim on the shores of Lake Sitojaure ("Sijddojávrre"). The trekking distance from Pielvalta to Rinim is about . As there is a boat connection between Rinim and the Sitojaure cabins on the Kungsleden, Pastavagge is a preferred route to and from central Sarek. The difference in altitude between the eastern entrance of the valley and the highest level of the pass is about . Because of the steep climb, multiple fords and the high-alpine terrain, it usually takes at least a full day for hikers to traverse the pass.