It seems like you're hinting at geographic landforms, possibly even cliffs, but which? There are three 'over the edge' deaths in Gondolin - Eol, Maeglin, and Glorfindel - and the first two are over the same cliff. It could be the abyss by Cirith Thoronath talking to Amon Gwareth, if we're ignoring Eol as being too long ago.
Though of course, the riddle says they're not the same... hrm.
Can we assume that the two in question are responsible only for two deaths, ever?
hS
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