Burnmoor Tarn

54°25′41″N 3°15′34″W / 54.42814°N 3.25953°W / 54.42814; -3.25953Primary outflowsWhillan BeckCatchment area6.02 km² (2.32 sq mi)Surface area23.9 ha (59 acres)Max. depth13 m (43 ft)Surface elevation253 m (830 ft)

Burnmoor Tarn, on Eskdale Fell in Cumbria, England, is the largest entirely natural tarns in the Lake District. Its waters flow into Whillan Beck at the tarn's north-eastern corner, which immediately turns south and flows into Eskdale, joining the Esk at Beckfoot.^[1] Burnmoor Lodge, a former fishing lodge, stands by the southern shore and a mediaeval corpse road runs past the eastern shore where it fords the beck.^[2][3] Eskdale Moor or Boat How lies to the south of the tarn.

The tarn is one of the sites in DEFRA's UK Upland Waters Monitoring Network.^[2] It occupies 23.9 hectares (59 acres) and lies at an altitude of 253 metres (830 ft) in a moraine hollow on the uplands between Wastwater and Eskdale. The lake has two distinct basins close to the south-eastern shore and a maximum depth of 13 metres (43 ft). There are four main inflow streams to the north and north-west. The outflow at the eastern end joins the Hardrigg Beck which drains the slopes of Scafell and, in times of especially high flow, is partly diverted into the lake across a braided delta.^[2]

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