Thread dredge.
... Roger Deakin in Waterlog ...
Currently reading this and really enjoying it.
Evoking many memories of growing up in Cambridge and swimming in the Cam/Granta/Rhee.
As for the original question:-
In a river - every day for many summers growing up, local sport of weir running (running in a big arc down the steep
concrete bank, across the 12ft weir and up the steep concrete bank the other side)
Large freshwater lake - yes, been on week long swimming holidays with wife/daughter to Lake Annecy the last couple of years, also have done Swim Serpentine the last 3 years
Loch/tarn/llyn etc - yes, scouts camping in Wales
Really cold water - Sea swimming at about 8 deg in April plus also a short bit of swimming during Tough Guy (wading through waist deep water and having to duck under a log and be completely submerged in 5 deg C water, oof)
Tidal Lagoon / rock pool - many places but the natural pool at Treyarnon Bay in Cornwall is a favourite, saw some people in there (no wetsuits) this weekend just gone
Cave - nope, don't get claustrophobia anywhere else except caves, no chance
Naked - plenty of skinny dipping when younger
What brought me to yacf to search for Waterlog / Roger Deakin was the passage:-
"
Swimming without a roof over your head is now a mildly subversive activity, like having an allotment, insisting on your right to walk a footpath, or riding a bicycle.
"
Haven't reached the allotment stage, yet.