- Rabbit Curry
- Boulder choke at the bottom of Pit and Pendulum (1990)
- Rabbit Warren Series
- Series leading from the Basement towards France (1988)
-
Ragnarök
- Big passage at the bottom of Left Hand Route (1989)
- Rainbow Pitch
- Pitch underneath Over The Rainbow in Right Hand Route (1988)
- The Ramp
- Ramp passage forming main way on in (and originally carrying the name of)
Wheelchair Access (1996)
- Rasputin
- Pitch at end of dried out streamway at the very bottom of Siberia, below
Midnight in Moscow with probably-unfeasiblew dig at end (1998) named because
it refused to die properly
- Redemption Pitch
- 28m pitch below Bottomless pit of Eternal Chaos (1996)
- Regurgitation
- Big chamber (bottom of aven) at end of Mohr in
Hemd (1994) named after popular eat-MiHs-until-you-throw-up game at
Hilde's
- Repton
Chamber
- Large chamber in two sections beyond CFN (1991)
- Repton I
- First half of Repton (Hyper Gamma Spaces end) (1991)
- Repton II
- Second half of Repton (Beehive end) (1991)
- Rich Tea
- Right turn in
descending boulder slope below Ginger Crunch (1994) several QMs hereabouts -
holes in floor, difficult climb up left
- The Riddler
- Crawl from north side of Crystal Clear Passage in 161f (1996)
- Rift Sans
Nom
- Rift above the squeeze on Checkout route (1988)
- Right Hand Route
- Route from Dewdrop/Becka Falls, to NE end of system (1988)
- Ring Piece Junction
- T-junction along Triassic Park, named after hole in floor (1995)
- Roast Beef
- Passage from
161e to the junction with Iceland and on to Bounce Rift (1996)
- Robinson Crusoe
- A 30m
passage from a ledge 10m up Francophobia to get stranded on in France,
leading to FCII (1991)
- Rocky Horror
- Hanging death passage beyond Fudge Brownie (1994)
- Rocky Horror Pitch
- Pitch at end of Rocky Horror, by Black Suspender (1994)
- Rocky Horror Rift
- High rift, actually lower portion of Rocky Horror itself. Reached just
below Rocky Horror Pitch on right, via 20m pitch (1994)
- Roll of the Dice
- 25m pitch below the Dice in France, below Francophobia (1991)
- Roomination Rifts
- Chossy rifts leading to 15m pitches, off Regurgitation (1999)
- Runny Bottom
- Strongly draughting series near the end of Lost in Space III in Chile
which doesn't seem to lead anywhere (1999)