Zambingo
Mentioned in The Fifth Elephant this is a port city located in Howandaland on the far side of Klatch, to which you must travel via Cape Terror if going by boat from Ankh-Morpork. Sir Samuel Vimes sent the Assassin the Hon Eustace Bassingly-Gore to Ghat in chains, and paid the captain of the ship AM$1000 not to untie him until at least Zambingo. Known to be full of jungles, where Bassingly-Gore's knowledge of poisons would undoubtedly be useful, but not as useful as a knowledge of antidotes...