[the phallic symbols are well-annotated, but the yonic ones are not]
the Coombe [fweet-13]
'originally a hollow or valley'
Gaping Gill [fweet-16]
Gaping Ghyl: a 330-foot deep vertical shaft in Yorkshire
various other hollows [fweet-26] and caves [fweet-54] and chasms [fweet-6] and valleys [fweet-48]
phallic: towers, hills, mountains, monuments, walls, skyscrapers