Diamondback is a steel roller coaster located at Kings Island in Mason, Ohio, United States. Manufactured by Bolliger & Mabillard (B&M), the ride opened in 2009 as the first hypercoaster to feature a splashdown effect and the first B&M roller coaster at Kings Island. It is located in Rivertown just behind International Street and the Eiffel Tower. Diamondback was the biggest investment in Kings Island’s history at the time, costing $22 million to build, but that figure was surpassed in 2014 by Banshee. The coaster features a 230-foot (70 m) lift hill with a 215-foot (66 m) drop and a maximum speed of 80 mph (130 km/h). It is similar to Behemoth at Canada's Wonderland in statistics, layout, and seating.