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Figure 86. Diagram showing the location of impounded water on, within, under, and adjacent to a glacier; the sudden release of water from such impoundments produces a jökulhlaup. A, Ice-margin lake caused by damming of a tributary valley or distributary glacier from the main trunk of a valley or outlet glacier; B, Proglacial lake at the terminus of a valley glacier or outlet glacier from an ice cap or ice field. C, Supraglacial lake (see fig. 87). D, Englacial lake. E, Subglacial lake. Modified from figure in Roberts (2005, p. 3 of 21, fig. 1).