Tokyo's benchmark stock index dropped more than four percent to finish at a six-month low on Monday, swept lower in a global equities rout as worries about China's economy deepen.

The Nikkei 225 at the Tokyo Stock Exchange plunged 4.61 percent, or 895.15 points, to end at 18,540.68 -- its lowest point since February -- with bank shares tumbling and Toyota losing more than 6.0 percent.

The broader Topix index of all first-section shares shed 5.86 percent, or 92.14 points, to close at 1,480.87.