An aerosol source for a vapor provision system includes a vapor-generating element; a reservoir for holding source liquid, the reservoir being bounded by a wall having an opening therein; and a liquid transport element including a first portion arranged to receive liquid from the reservoir via the opening, a second portion peripheral to the first portion, and a third portion arranged to deliver liquid from the first portion to the vapor-generating element; wherein at least part of the second portion is compressed against a section of the wall around the opening, in use, to provide a sealing effect around at least part of the first portion to promote movement of liquid towards the vapor-generating element.