Harry the Poisonous Centipede Goes To Sea, Paperback/Lynne Reid Banks

Harry the Poisonous Centipede is now quite brave, but nothing can prepare him for this next adventure! He and best friend George are lost in a new and even scarier no-top world. Far from home, across the no-end puddle, they must negotiate a strange treeless cold desert, a Nest of Hoo-Mins, lots of noise-hurt and terrifying hairy-yowlers!