The GMC Acadia is a full-size crossover SUV from GMC. The GMC Acadia, Chevrolet Traverse, and Buick Enclave share the new GM Lambda platform. The Acadia went on sale in the United States in December 2006, and in Canada in January 2007. The Acadia replaces three of the seven or eight-passenger vehicles on the Pontiac-Buick-GMC dealership network, the mid-sizeGMC Safari van, the GMC Envoy, and the Pontiac Montana SV6 minivan for the USA only. As of 2009, the Lambda vehicles have replaced the Buick Rainier, Buick Rendezvous, and the Buick Terraza, and then subsequently the GMC Envoy and the Chevrolet TrailBlazer. A Denali version of the Acadia debuted in 2010 as a 2011 model.