One early-morning buzz around snow-topped Mount Kenya later, we landed near a glacial lake for a bracing bit of fly-fishing.

FORBES: Escapes

Halfway through the eight-hour excursion, a picnic lunch is served by an emerald glacial lake where guests have been known to jump into for an invigorating (read: freezing) swim.

BBC: North America by cable and bridge

He told BBC News that ice-coring "doesn't really work as a viable technique to do long-term, clean access and exploration of sub-glacial lake environments - because of the issues with cleanliness and sterility".

BBC: 'New frontier' of Antarctic lake exploration

In the Himalayas alone, some 44 glacier lakes are filling so rapidly that they could burst their debris retaining walls in the next four or five years, in what are known as 'glacial lake outburst floods' (GLOFs).

UNESCO: 83e

Golzernsee itself is a small alpine lake in a glacial trough, perfect for summer swims and picnics.

BBC: In Swiss utopia, the devil dwelled

The 55-acre South Island parcel sat on the shores of Lake Wakatipu, whose waters come from glacial-melt rivers originating in Fiordland National Park.

FORBES: "We Weren't Hut People"

This research could help scientists find out more about possible life in Lake Vostok, the largest of over 70 sub-glacial lakes on the White Continent, which lies more than four km beneath the East Antarctic Ice Sheet.

BBC: Antarctic lake's secret water

Just 20 miles due west of the city is a 10-foot-high glacial moraine that separates the Mississippi and its vast north-south system of tributaries from the Great Lake waterways.

FORBES: A most unromantic river