Which spider builds the largest webs in the world?

Darwin's bark spider is an orb-weaver spider that produces one of the largest known orb webs, with bridge lines spanning up to 25 metres (82 ft). The spider was discovered in Madagascar in the Andasibe-Mantadia National Park in 2009. Its silk is the toughest biological material ever studied, over ten times tougher than a similarly-sized piece of Kevlar.