I am glad to see some of my favourite entrances to hell listed here, such as
and Banu (http://www.entrances2hell.co.uk/page321.html)
Though be warned, that 'Banu has become a dangerous place since being upgraded in 1999. It now forms an intersection between the flat universe and the bevelled universe. For humans this means that Banu drinks the spirit, halves the mind, and causes stomach problems.'
Although there is a map, I don't recommend approaching this entrance to hell, except in protective clothing.