Kimba the White Lion
The idea of a graveyard for elephants was popularised in films such as "Trader Horn" and MGM's Tarzan films, in which groups of greedy explorers attempt to locate the elephants' graveyard, on the fictional Mutia Escarpment, in search of its riches of ivory. Osamu Tezuka's "Kimba the White Lion" episode "A Friend in Deed" centred around it.